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CVE-2026-80644

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 10995aa2451afa20b721cc7de856cae1a13dba57, <2.6.29, <=6.12.*, 6.18.40, 7.1.5, 0, <=7.1.*, 2.6.29, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0, <c0438198c28b1d22c272751af5e717c11d9fa8dd, <=6.18.*, <a06eec15596e5801bad59ad16cd2bf4f0fa839a1, 5.15.212, 6.6.145, 5.10.261, <5b33f99f3e48465bd93219495381a5aef4fa967f, <86509c5296fe46ad6bcdd83931a53c2c6b7913a8, <b460f8d01a12061853d02c8fb693fb42450acd7d, <=*, <=5.15.*, 7.2, <3852478d34c7baa490ba9c7374ee901a56eea577, <12c32a7350b670aaaaf2e01583d8648ec0c9755c

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: don't BUG_ON an invalid journal dinode [BUG] A fuzzed OCFS2 image can corrupt the current slot journal dinode while mount is still in progress. The mount path first reports the invalid journal block and then crashes in shutdown: kernel BUG at fs/ocfs2/journal.c:1034! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:ocfs2_journal_toggle_dirty+0x2d6/0x340 fs/ocfs2/journal.c:1034 Call Trace: ocfs2_journal_shutdown+0x414/0xc30 fs/ocfs2/journal.c:1116 ocfs2_mount_volume fs/ocfs2/super.c:1785 [inline] ocfs2_fill_super+0x30a9/0x3cd0 fs/ocfs2/super.c:1083 get_tree_bdev_flags+0x38b/0x640 fs/super.c:1698 get_tree_bdev+0x24/0x40 fs/super.c:1721 ocfs2_get_tree+0x21/0x30 fs/ocfs2/super.c:1184 vfs_get_tree+0x9a/0x370 fs/super.c:1758 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3642 [inline] do_new_mount fs/namespace.c:3718 [inline] path_mount+0x5b8/0x1ea0 fs/namespace.c:4028 do_mount fs/namespace.c:4041 [inline] __do_sys_mount fs/namespace.c:4229 [inline] __se_sys_mount fs/namespace.c:4206 [inline] __x64_sys_mount+0x282/0x320 fs/namespace.c:4206 ... [CAUSE] ocfs2_journal_toggle_dirty() used to return -EIO when journal->j_bh no longer contained a valid dinode, because the startup and shutdown paths already handled that failure. Commit 10995aa2451a ("ocfs2: Morph the haphazard OCFS2_IS_VALID_DINODE() checks.") changed the check to a BUG_ON() under the assumption that the journal dinode had already been validated. That turns an unexpected invalid journal dinode during mount teardown into a kernel crash instead of a normal mount failure. [FIX] Replace the BUG_ON() with WARN_ON() and return -EIO. This keeps the invariant warning for debugging, but restores the original behavior of failing startup or shutdown cleanly instead of panicking the kernel.

Gravité et risque d'exploitation

CVE-2026-80644 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.22 %, ce qui la place devant 11.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 10995aa2451afa20b721cc7de856cae1a13dba57, <2.6.29, <=6.12.*, 6.18.40, 7.1.5, 0, <=7.1.*, 2.6.29, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0, <c0438198c28b1d22c272751af5e717c11d9fa8dd, <=6.18.*, <a06eec15596e5801bad59ad16cd2bf4f0fa839a1, 5.15.212, 6.6.145, 5.10.261, <5b33f99f3e48465bd93219495381a5aef4fa967f, <86509c5296fe46ad6bcdd83931a53c2c6b7913a8, <b460f8d01a12061853d02c8fb693fb42450acd7d, <=*, <=5.15.*, 7.2, <3852478d34c7baa490ba9c7374ee901a56eea577, <12c32a7350b670aaaaf2e01583d8648ec0c9755c) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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