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CVE-2026-74363

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <5.15.212, e28616ca3d67e745ecb2f10eba4a626e1fc9a203, 0, <=7.1.*, 6.17.4, <0497ff765746d9b2d17445c8f7cc737b36c0152a, <c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2, 6.18, 6.1.178, 4f375ade6aa9f37fd72d7a78682f639772089eed, <=6.6.*, 6.12.97, b6e9645be9eb93f7aff3ca887f8edb6f1d63358f, <6.1.178, 5.15.195, <=6.18.*, 5.15.212, 6.6.145, de2d2baecc84cc7fca52eec2b9b55d89c93e3565, 6.6.113, <6.18, <6.6.145, <=*, ee04cff9ed4d6bb25802f5cecfcd0750500410f3, <53649846e0437d1d9b7cb993cfe54c367addf7ae, <=5.15.*, <ea1c243c39e32b7fc1c2edfe32081ff7e30a877c, <61f19729728243c82476dee31315143ed3275e7f, <6.12.97, 6.1.157, <b93c55b4932dd7e32dca8cf34a3443cc87a02906, 7.2, 6.12.54, <5fecb71c10c28aef276ba49c718dc961745fdcf0, 743a620c661994c7f0938e6dd32fb0883fb1e0ea

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs commit 4f375ade6aa9 ("bpf: Avoid RCU context warning when unpinning htab with internal structs") moved inode cleanup from ->free_inode() into ->destroy_inode() to avoid sleeping in RCU context when calling bpf_any_put(). However this removed the RCU delay on freeing the inode itself and the cached symlink body (i_link), both of which can be accessed by RCU pathwalk (pick_link, may_lookup etc.). This causes a use-after-free when a concurrent unlinkat() drops the last inode reference and destroy_inode() frees the inode immediately, while another task is still walking the path in RCU mode and reads inode->i_opflags (offset +2) inside current_time() -> is_mgtime(). KASAN reports: BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313 Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags) The rules (per Al Viro): ->destroy_inode() called immediately, can sleep, use for blocking cleanup e.g. bpf_any_put() ->free_inode() called after RCU grace period, use for freeing inode and anything RCU-accessible e.g. i_link Fix: split the two concerns properly: - keep bpf_any_put() in bpf_destroy_inode() since it is blocking and needs to run promptly - introduce bpf_free_inode() to handle kfree(i_link) and free_inode_nonrcu() with proper RCU delay, preventing the UAF

Gravité et risque d'exploitation

CVE-2026-74363 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.0 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <5.15.212, e28616ca3d67e745ecb2f10eba4a626e1fc9a203, 0, <=7.1.*, 6.17.4, <0497ff765746d9b2d17445c8f7cc737b36c0152a, <c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2, 6.18, 6.1.178, 4f375ade6aa9f37fd72d7a78682f639772089eed, <=6.6.*, 6.12.97, b6e9645be9eb93f7aff3ca887f8edb6f1d63358f, <6.1.178, 5.15.195, <=6.18.*, 5.15.212, 6.6.145, de2d2baecc84cc7fca52eec2b9b55d89c93e3565, 6.6.113, <6.18, <6.6.145, <=*, ee04cff9ed4d6bb25802f5cecfcd0750500410f3, <53649846e0437d1d9b7cb993cfe54c367addf7ae, <=5.15.*, <ea1c243c39e32b7fc1c2edfe32081ff7e30a877c, <61f19729728243c82476dee31315143ed3275e7f, <6.12.97, 6.1.157, <b93c55b4932dd7e32dca8cf34a3443cc87a02906, 7.2, 6.12.54, <5fecb71c10c28aef276ba49c718dc961745fdcf0, 743a620c661994c7f0938e6dd32fb0883fb1e0ea) 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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