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  • changed/a8/kernel-4.18.0-553.124.3.el8_10 e1dbabe6cc

    Bump version to 4.18.0-553.124.3

    Ghost released this 2026-05-14 12:59:08 +00:00 | -92 commits to c8 since this release

    net: skbuff: propagate shared-frag marker through frag-transfer helpers

    Replace 553.124.2's partial fix (which was a backport of Hyunwoo Kim's
    v1 patch covering only __pskb_copy_fclone() and skb_try_coalesce())
    with a backport of the upstream v3 patch:
    https://lore.kernel.org/all/agW4vC0r8QOUKtRT@v4bel/

    v3 also covers skb_shift() (the new hunk added in v2) and
    skb_gro_receive() / skb_gro_receive_list() (the audit follow-up
    suggested by Sultan Alsawaf in agVpIsaSherjHTYg@sultan-box).

    All five sites moved frag descriptors between skbs without
    propagating the SKBFL_SHARED_FRAG marker (SKBTX_SHARED_FRAG on 4.18),
    so destinations could end up referencing externally-owned or
    page-cache-backed pages while reporting skb_has_shared_frag() as
    false. Combined with ESP-over-UDP and UDP GRO, or any
    nf_dup_ipv4 / xt_TEE caller, this lets an unprivileged user trigger
    in-place ESP decryption over root-owned page-cache pages
    (CVE-2026-46300, "Fragnesia").

    Tree-adapted to the 4.18 kernel: SKBFL_SHARED_FRAG / shinfo->flags
    back to the legacy SKBTX_SHARED_FRAG / shinfo->tx_flags, and
    skb_gro_receive() / skb_gro_receive_list() targeting net/core/skbuff.c
    since the net/core/gro.c split (upstream v5.19) is not in 4.18.

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