From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: B Horn Date: Fri, 1 Nov 2024 19:24:29 +0000 Subject: [PATCH] commands/pgp: Unregister the "check_signatures" hooks on module unload If the hooks are not removed they can be called after the module has been unloaded leading to an use-after-free. Fixes: CVE-2025-0622 Reported-by: B Horn Signed-off-by: B Horn Reviewed-by: Daniel Kiper --- grub-core/commands/pgp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/grub-core/commands/pgp.c b/grub-core/commands/pgp.c index 847a5046a..fa3ef5c75 100644 --- a/grub-core/commands/pgp.c +++ b/grub-core/commands/pgp.c @@ -982,6 +982,8 @@ GRUB_MOD_INIT(pgp) GRUB_MOD_FINI(pgp) { + grub_register_variable_hook ("check_signatures", NULL, NULL); + grub_env_unset ("check_signatures"); grub_verifier_unregister (&grub_pubkey_verifier); grub_unregister_extcmd (cmd); grub_unregister_extcmd (cmd_trust);