2021-07-26 16:37:04 +00:00
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Intel Skylake Scalable Platform CPU models that belong to Workstation and HEDT
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(Basin Falls) segment (SKL-W/X, family 6, model 85, stepping 4) had reports
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of system hangs on reboot when revision 0x2000065 of microcode, that was included
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from microcode-20191112 update up to microcode-20200520 update, was applied[1].
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In order to address this, microcode update to the newer revision had been
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disabled by default on these systems, and the previously published microcode
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revision 0x2000064 is used by default for the OS-driven microcode update.
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Since revision 0x2006906 (included with the microcode-20200609 release)
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it is reported that the issue is no longer present, so the newer microcode
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revision is enabled by default now (but can be disabled explicitly; see below).
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[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/21
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For the reference, SHA1 checksums of 06-55-04 microcode files containing
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microcode revisions in question are listed below:
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* 06-55-04, revision 0x2000064: 2e405644a145de0f55517b6a9de118eec8ec1e5a
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* 06-55-04, revision 0x2000065: f27f12b9d53f492c297afd856cdbc596786fad23
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* 06-55-04, revision 0x2006906: 5f18f985f6d5ad369b5f6549b7f3ee55acaef967
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* 06-55-04, revision 0x2006a08: 4059fb1f60370297454177f63cd7cc20b3fa1212
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* 06-55-04, revision 0x2006a0a: 7ec27025329c82de9553c14a78733ad1013e5462
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* 06-55-04, revision 0x2006b06: cb5bec976cb9754e3a22ab6828b3262a8f9eccf7
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2022-01-30 20:57:00 +00:00
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* 06-55-04, revision 0x2006c0a: 76b641375d136c08f5feb46aacebee40468ac085
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Update Intel CPU microcode to microcode-20220510 release
- Update Intel CPU microcode to microcode-20220510 release, addresses
CVE-2022-0005, CVE-2022-21131, CVE-2022-21136, CVE-2022-21151 (#2086743):
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode (in
intel-ucode/06-97-02) at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode (in intel-ucode/06-97-02)
at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode (in intel-ucode/06-97-02)
at revision 0x1f;
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode (in
intel-ucode/06-97-05) at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode (in intel-ucode/06-97-05)
at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode (in intel-ucode/06-97-05)
at revision 0x1f;
- Addition of 06-9a-03/0x80 (ADL-P 6+8/U 9W L0/R0) microcode at
revision 0x41c;
- Addition of 06-9a-04/0x80 (ADL-P 2+8 R0) microcode (in
intel-ucode/06-9a-03) at revision 0x41c;
- Addition of 06-9a-03/0x80 (ADL-P 6+8/U 9W L0/R0) microcode (in
intel-ucode/06-9a-04) at revision 0x41c;
- Addition of 06-9a-04/0x80 (ADL-P 2+8 R0) microcode at revision 0x41c;
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode (in
intel-ucode/06-bf-02) at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode (in
intel-ucode/06-bf-02) at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode (in intel-ucode/06-bf-02)
at revision 0x1f;
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode (in
intel-ucode/06-bf-05) at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode (in
intel-ucode/06-bf-05) at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode (in intel-ucode/06-bf-05)
at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode at revision 0x1f;
- Update of 06-4e-03/0xc0 (SKL-U/U 2+3e/Y D0/K1) microcode (in
intel-06-4e-03/intel-ucode/06-4e-03) from revision 0xec up to 0xf0;
- Update of 06-55-04/0xb7 (SKX-D/SP/W/X H0/M0/M1/U0) microcode (in
intel-06-55-04/intel-ucode/06-55-04) from revision 0x2006c0a up
to 0x2006d05;
- Update of 06-5e-03/0x36 (SKL-H/S/Xeon E3 N0/R0/S0) microcode (in
intel-06-5e-03/intel-ucode/06-5e-03) from revision 0xec up to 0xf0;
- Update of 06-8c-01/0x80 (TGL-UP3/UP4 B1) microcode (in
intel-06-8c-01/intel-ucode/06-8c-01) from revision 0x9a up to 0xa4;
- Update of 06-8e-09/0x10 (AML-Y 2+2 H0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-09) from revision 0xec up
to 0xf0;
- Update of 06-8e-09/0xc0 (KBL-U/U 2+3e/Y H0/J1) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-09) from revision 0xec up
to 0xf0;
- Update of 06-8e-0a/0xc0 (CFL-U 4+3e D0, KBL-R Y0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-0a) from revision 0xec up
to 0xf0;
- Update of 06-8e-0b/0xd0 (WHL-U W0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-0b) from revision 0xec up
to 0xf0;
- Update of 06-8e-0c/0x94 (AML-Y 4+2 V0, CML-U 4+2 V0, WHL-U V0)
microcode (in intel-06-8e-9e-0x-dell/intel-ucode/06-8e-0c) from
revision 0xec up to 0xf0;
- Update of 06-9e-09/0x2a (KBL-G/H/S/X/Xeon E3 B0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-09) from revision 0xec up
to 0xf0;
- Update of 06-9e-0a/0x22 (CFL-H/S/Xeon E U0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0a) from revision 0xec up
to 0xf0;
- Update of 06-9e-0b/0x02 (CFL-E/H/S B0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0b) from revision 0xec up
to 0xf0;
- Update of 06-9e-0c/0x22 (CFL-H/S/Xeon E P0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0c) from revision 0xec up
to 0xf0;
- Update of 06-9e-0d/0x22 (CFL-H/S/Xeon E R0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0d) from revision 0xec up
to 0xf0;
- Update of 06-37-09/0x0f (VLV D0) microcode from revision 0x90c up
to 0x90d;
- Update of 06-55-03/0x97 (SKX-SP B1) microcode from revision 0x100015c
up to 0x100015d;
- Update of 06-55-06/0xbf (CLX-SP B0) microcode from revision 0x400320a
up to 0x4003302;
- Update of 06-55-07/0xbf (CLX-SP/W/X B1/L1) microcode from revision
0x500320a up to 0x5003302;
- Update of 06-55-0b/0xbf (CPX-SP A1) microcode from revision 0x7002402
up to 0x7002501;
- Update of 06-5c-09/0x03 (APL D0) microcode from revision 0x46 up
to 0x48;
- Update of 06-5c-0a/0x03 (APL B1/F1) microcode from revision 0x24 up
to 0x28;
- Update of 06-5f-01/0x01 (DNV B0) microcode from revision 0x36 up
to 0x38;
- Update of 06-6a-06/0x87 (ICX-SP D0) microcode from revision 0xd000331
up to 0xd000363;
- Update of 06-7a-01/0x01 (GLK B0) microcode from revision 0x38 up
to 0x3a;
- Update of 06-7a-08/0x01 (GLK-R R0) microcode from revision 0x1c up
to 0x1e;
- Update of 06-7e-05/0x80 (ICL-U/Y D1) microcode from revision 0xa8
up to 0xb0;
- Update of 06-8a-01/0x10 (LKF B2/B3) microcode from revision 0x2d up
to 0x31;
- Update of 06-8c-02/0xc2 (TGL-R C0) microcode from revision 0x22 up
to 0x26;
- Update of 06-8d-01/0xc2 (TGL-H R0) microcode from revision 0x3c up
to 0x3e;
- Update of 06-96-01/0x01 (EHL B1) microcode from revision 0x15 up
to 0x16;
- Update of 06-9c-00/0x01 (JSL A0/A1) microcode from revision 0x2400001f
up to 0x24000023;
- Update of 06-a5-02/0x20 (CML-H R1) microcode from revision 0xec up
to 0xf0;
- Update of 06-a5-03/0x22 (CML-S 6+2 G1) microcode from revision 0xec
up to 0xf0;
- Update of 06-a5-05/0x22 (CML-S 10+2 Q0) microcode from revision 0xee
up to 0xf0;
- Update of 06-a6-00/0x80 (CML-U 6+2 A0) microcode from revision 0xea
up to 0xf0;
- Update of 06-a6-01/0x80 (CML-U 6+2 v2 K1) microcode from revision
0xec up to 0xf0;
- Update of 06-a7-01/0x02 (RKL-S B0) microcode from revision 0x50 up
to 0x53.
* .gitignore: Replace /microcode-20220207.tar.gz entry with
/microcode-20220510.tar.gz.
* 0001-releasenote.md-changes-summary-fixes-for-microcode-2.patch: New
patch.
* 06-4e-03_readme: Add a checksum for revision 0xf0, add the link
to the 2022.1 IPU KB article.
* 06-55-04_readme: Add a checksum for revision 0x2006d05, add the link
to the 2022.1 IPU KB article.
* 06-5e-03_readme: Add a checksum for revision 0xf0, add the link
to the 2022.1 IPU KB article.
* 06-8c-01_readme: Add a checksum for revision 0xa4, add the link
to the 2022.1 IPU KB article.
* 06-8e-9e-0x-0xca_readme: Add checksums for revision 0xf0, add the link
to the 2022.1 IPU KB article.
* 06-8e-9e-0x-dell_readme: Likewise.
* codenames.list: Add an entry for CPU signatures 90672 (ADL-S/HX C0),
90675 (ADL-S K0), 906a3 (ADL-P L0, ADL-U R0), 906a4 (ADL-P R0),
b06f2 (ADL C0), and b06f5 (ADL C0).
* microcode_ctl.spec (intel_ucode_version): Bump to 20220510.
(Patch1001): New patch (fixes in releasenote.md).
(%prep): Apply it.
(%changelog): Add a record.
* sources: Replace microcode-20220207.tar.gz record with
microcode-20220510.tar.gz.
Resolves: #2090248
Resolves: #2090261
Resolves: #2086751
Resolves: #2040069
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
2022-06-10 17:26:33 +00:00
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* 06-55-04, revision 0x2006d05: dc4207cf4eb916ff34acbdddc474db0df781234f
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2022-09-20 05:10:23 +00:00
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* 06-55-04, revision 0x2006e05: bc67d247ad1c9a834bec5e452606db1381d6bc7e
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2021-07-26 16:37:04 +00:00
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Please contact your system vendor for a BIOS/firmware update that contains
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the latest microcode version. For the information regarding microcode versions
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required for mitigating specific side-channel cache attacks, please refer
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to the following knowledge base articles:
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* CVE-2017-5715 ("Spectre"):
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https://access.redhat.com/articles/3436091
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* CVE-2018-3639 ("Speculative Store Bypass"):
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https://access.redhat.com/articles/3540901
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* CVE-2018-3620, CVE-2018-3646 ("L1 Terminal Fault Attack"):
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https://access.redhat.com/articles/3562741
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* CVE-2018-12130, CVE-2018-12126, CVE-2018-12127, and CVE-2019-11091
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("Microarchitectural Data Sampling"):
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https://access.redhat.com/articles/4138151
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* CVE-2019-0117 (Intel SGX Information Leak),
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CVE-2019-0123 (Intel SGX Privilege Escalation),
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CVE-2019-11135 (TSX Asynchronous Abort),
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CVE-2019-11139 (Voltage Setting Modulation):
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https://access.redhat.com/solutions/2019-microcode-nov
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* CVE-2020-0543 (Special Register Buffer Data Sampling),
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CVE-2020-0548 (Vector Register Data Sampling),
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CVE-2020-0549 (L1D Cache Eviction Sampling):
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https://access.redhat.com/solutions/5142751
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* CVE-2020-8695 (Information disclosure issue in Intel SGX via RAPL interface),
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CVE-2020-8696 (Vector Register Leakage-Active),
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CVE-2020-8698 (Fast Forward Store Predictor):
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https://access.redhat.com/articles/5569051
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* CVE-2020-24489 (VT-d-related Privilege Escalation),
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CVE-2020-24511 (Improper Isolation of Shared Resources),
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CVE-2020-24512 (Observable Timing Discrepancy),
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CVE-2020-24513 (Information Disclosure on Some Intel Atom Processors):
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https://access.redhat.com/articles/6101171
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2022-01-30 20:57:00 +00:00
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* CVE-2021-0127 (Intel Processor Breakpoint Control Flow):
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https://access.redhat.com/articles/6716541
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Update Intel CPU microcode to microcode-20220510 release
- Update Intel CPU microcode to microcode-20220510 release, addresses
CVE-2022-0005, CVE-2022-21131, CVE-2022-21136, CVE-2022-21151 (#2086743):
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode (in
intel-ucode/06-97-02) at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode (in intel-ucode/06-97-02)
at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode (in intel-ucode/06-97-02)
at revision 0x1f;
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode (in
intel-ucode/06-97-05) at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode (in intel-ucode/06-97-05)
at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode (in intel-ucode/06-97-05)
at revision 0x1f;
- Addition of 06-9a-03/0x80 (ADL-P 6+8/U 9W L0/R0) microcode at
revision 0x41c;
- Addition of 06-9a-04/0x80 (ADL-P 2+8 R0) microcode (in
intel-ucode/06-9a-03) at revision 0x41c;
- Addition of 06-9a-03/0x80 (ADL-P 6+8/U 9W L0/R0) microcode (in
intel-ucode/06-9a-04) at revision 0x41c;
- Addition of 06-9a-04/0x80 (ADL-P 2+8 R0) microcode at revision 0x41c;
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode (in
intel-ucode/06-bf-02) at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode (in
intel-ucode/06-bf-02) at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode (in intel-ucode/06-bf-02)
at revision 0x1f;
- Addition of 06-97-02/0x03 (ADL-HX C0) microcode (in
intel-ucode/06-bf-05) at revision 0x1f;
- Addition of 06-97-05/0x03 (ADL-S 6+0 K0) microcode (in
intel-ucode/06-bf-05) at revision 0x1f;
- Addition of 06-bf-02/0x03 (ADL C0) microcode (in intel-ucode/06-bf-05)
at revision 0x1f;
- Addition of 06-bf-05/0x03 (ADL C0) microcode at revision 0x1f;
- Update of 06-4e-03/0xc0 (SKL-U/U 2+3e/Y D0/K1) microcode (in
intel-06-4e-03/intel-ucode/06-4e-03) from revision 0xec up to 0xf0;
- Update of 06-55-04/0xb7 (SKX-D/SP/W/X H0/M0/M1/U0) microcode (in
intel-06-55-04/intel-ucode/06-55-04) from revision 0x2006c0a up
to 0x2006d05;
- Update of 06-5e-03/0x36 (SKL-H/S/Xeon E3 N0/R0/S0) microcode (in
intel-06-5e-03/intel-ucode/06-5e-03) from revision 0xec up to 0xf0;
- Update of 06-8c-01/0x80 (TGL-UP3/UP4 B1) microcode (in
intel-06-8c-01/intel-ucode/06-8c-01) from revision 0x9a up to 0xa4;
- Update of 06-8e-09/0x10 (AML-Y 2+2 H0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-09) from revision 0xec up
to 0xf0;
- Update of 06-8e-09/0xc0 (KBL-U/U 2+3e/Y H0/J1) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-09) from revision 0xec up
to 0xf0;
- Update of 06-8e-0a/0xc0 (CFL-U 4+3e D0, KBL-R Y0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-0a) from revision 0xec up
to 0xf0;
- Update of 06-8e-0b/0xd0 (WHL-U W0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-8e-0b) from revision 0xec up
to 0xf0;
- Update of 06-8e-0c/0x94 (AML-Y 4+2 V0, CML-U 4+2 V0, WHL-U V0)
microcode (in intel-06-8e-9e-0x-dell/intel-ucode/06-8e-0c) from
revision 0xec up to 0xf0;
- Update of 06-9e-09/0x2a (KBL-G/H/S/X/Xeon E3 B0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-09) from revision 0xec up
to 0xf0;
- Update of 06-9e-0a/0x22 (CFL-H/S/Xeon E U0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0a) from revision 0xec up
to 0xf0;
- Update of 06-9e-0b/0x02 (CFL-E/H/S B0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0b) from revision 0xec up
to 0xf0;
- Update of 06-9e-0c/0x22 (CFL-H/S/Xeon E P0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0c) from revision 0xec up
to 0xf0;
- Update of 06-9e-0d/0x22 (CFL-H/S/Xeon E R0) microcode (in
intel-06-8e-9e-0x-dell/intel-ucode/06-9e-0d) from revision 0xec up
to 0xf0;
- Update of 06-37-09/0x0f (VLV D0) microcode from revision 0x90c up
to 0x90d;
- Update of 06-55-03/0x97 (SKX-SP B1) microcode from revision 0x100015c
up to 0x100015d;
- Update of 06-55-06/0xbf (CLX-SP B0) microcode from revision 0x400320a
up to 0x4003302;
- Update of 06-55-07/0xbf (CLX-SP/W/X B1/L1) microcode from revision
0x500320a up to 0x5003302;
- Update of 06-55-0b/0xbf (CPX-SP A1) microcode from revision 0x7002402
up to 0x7002501;
- Update of 06-5c-09/0x03 (APL D0) microcode from revision 0x46 up
to 0x48;
- Update of 06-5c-0a/0x03 (APL B1/F1) microcode from revision 0x24 up
to 0x28;
- Update of 06-5f-01/0x01 (DNV B0) microcode from revision 0x36 up
to 0x38;
- Update of 06-6a-06/0x87 (ICX-SP D0) microcode from revision 0xd000331
up to 0xd000363;
- Update of 06-7a-01/0x01 (GLK B0) microcode from revision 0x38 up
to 0x3a;
- Update of 06-7a-08/0x01 (GLK-R R0) microcode from revision 0x1c up
to 0x1e;
- Update of 06-7e-05/0x80 (ICL-U/Y D1) microcode from revision 0xa8
up to 0xb0;
- Update of 06-8a-01/0x10 (LKF B2/B3) microcode from revision 0x2d up
to 0x31;
- Update of 06-8c-02/0xc2 (TGL-R C0) microcode from revision 0x22 up
to 0x26;
- Update of 06-8d-01/0xc2 (TGL-H R0) microcode from revision 0x3c up
to 0x3e;
- Update of 06-96-01/0x01 (EHL B1) microcode from revision 0x15 up
to 0x16;
- Update of 06-9c-00/0x01 (JSL A0/A1) microcode from revision 0x2400001f
up to 0x24000023;
- Update of 06-a5-02/0x20 (CML-H R1) microcode from revision 0xec up
to 0xf0;
- Update of 06-a5-03/0x22 (CML-S 6+2 G1) microcode from revision 0xec
up to 0xf0;
- Update of 06-a5-05/0x22 (CML-S 10+2 Q0) microcode from revision 0xee
up to 0xf0;
- Update of 06-a6-00/0x80 (CML-U 6+2 A0) microcode from revision 0xea
up to 0xf0;
- Update of 06-a6-01/0x80 (CML-U 6+2 v2 K1) microcode from revision
0xec up to 0xf0;
- Update of 06-a7-01/0x02 (RKL-S B0) microcode from revision 0x50 up
to 0x53.
* .gitignore: Replace /microcode-20220207.tar.gz entry with
/microcode-20220510.tar.gz.
* 0001-releasenote.md-changes-summary-fixes-for-microcode-2.patch: New
patch.
* 06-4e-03_readme: Add a checksum for revision 0xf0, add the link
to the 2022.1 IPU KB article.
* 06-55-04_readme: Add a checksum for revision 0x2006d05, add the link
to the 2022.1 IPU KB article.
* 06-5e-03_readme: Add a checksum for revision 0xf0, add the link
to the 2022.1 IPU KB article.
* 06-8c-01_readme: Add a checksum for revision 0xa4, add the link
to the 2022.1 IPU KB article.
* 06-8e-9e-0x-0xca_readme: Add checksums for revision 0xf0, add the link
to the 2022.1 IPU KB article.
* 06-8e-9e-0x-dell_readme: Likewise.
* codenames.list: Add an entry for CPU signatures 90672 (ADL-S/HX C0),
90675 (ADL-S K0), 906a3 (ADL-P L0, ADL-U R0), 906a4 (ADL-P R0),
b06f2 (ADL C0), and b06f5 (ADL C0).
* microcode_ctl.spec (intel_ucode_version): Bump to 20220510.
(Patch1001): New patch (fixes in releasenote.md).
(%prep): Apply it.
(%changelog): Add a record.
* sources: Replace microcode-20220207.tar.gz record with
microcode-20220510.tar.gz.
Resolves: #2090248
Resolves: #2090261
Resolves: #2086751
Resolves: #2040069
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
2022-06-10 17:26:33 +00:00
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* CVE-2022-0005 (Informational disclosure via JTAG),
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CVE-2022-21123 (Shared Buffers Data Read),
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CVE-2022-21125 (Shared Buffers Data Sampling),
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CVE-2022-21127 (Update to Special Register Buffer Data Sampling),
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CVE-2022-21131 (Protected Processor Inventory Number (PPIN) access protection),
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CVE-2022-21136 (Overclocking service access protection),
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CVE-2022-21151 (Optimization Removal-Induced Informational Disclosure),
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CVE-2022-21166 (Device Register Partial Write):
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https://access.redhat.com/articles/6963124
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2022-09-20 05:10:23 +00:00
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* CVE-2022-21233 (Stale Data Read from legacy xAPIC):
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https://access.redhat.com/articles/6976398
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2021-07-26 16:37:04 +00:00
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The information regarding disabling microcode update is provided below.
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To disable usage of the newer microcode revision for a specific kernel
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version, please create a file "disallow-intel-06-55-04" inside
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/lib/firmware/<kernel_version> directory, run
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"/usr/libexec/microcode_ctl/update_ucode" to update firmware directory
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used for late microcode updates, and run "dracut -f --kver <kernel_version>"
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so initramfs for this kernel version is regenerated, for example:
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touch /lib/firmware/3.10.0-862.9.1/disallow-intel-06-55-04
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/usr/libexec/microcode_ctl/update_ucode
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dracut -f --kver 3.10.0-862.9.1
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To disable usage of the newer microcode revision for all kernels, please create
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file "/etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-55-04", run
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"/usr/libexec/microcode_ctl/update_ucode" to update firmware directories
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used for late microcode updates, and run "dracut -f --regenerate-all"
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so initramfs images get regenerated, for example:
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mkdir -p /etc/microcode_ctl/ucode_with_caveats
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touch /etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-55-04
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/usr/libexec/microcode_ctl/update_ucode
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dracut -f --regenerate-all
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Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional
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information.
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