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CVE-2026-68137

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.5%
Linux•Linux•Versions : 5c94b6205e87411dbe9dc1ca088eb36b8837fb47, 9acf05b4e7b55fdb712ef7b331dbce5bcd391d0f, 5.15.33, <=6.1.*, <=6.12.*, <5499e0602d2faafd42c580d25f615903c3fbe11b, 5.18, 6.12.101, <5.10.265, <db6b04f6d65549bb1c7bc8e64a92e7b7d03be676, 409570a619c1cda2e0fde6018a256b9e3d3ba0ee, 0, <5.15.216, 4c240c5a105557e4546d0836e694868f22fd09b0, 7781607938c8371d4c2b243527430241c62e39c2, <=7.1.*, <4.10, 5.15.216, <5.17, <5.18, <4.20, <=5.10.*, <3f4fe26c20c30bd5a2e2583e80685def0b27858c, 4.9.311, <=6.6.*, dffc859d1d9560da594e4282091781b8d2715f00, 4a279d7ee1c65411b4055ecd428b8aa2b1711c1f, 6.18.42, <c98a454d1a9e1bd09d5fd55a7aa589b199340b88, 7.1.6, 5.4.189, 858642789ada1b48630f322e59416ca9fca3e6b7, 6.1.183, <5.5, 671529db75e6be777bb1c76aa07c2bdd2992be6d, <=6.18.*, <ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a, 5.16.19, 5.10.110, 4.14.276, 5.17.2, <=*, 4.19.238, <=5.15.*, <5e8a754ac2009a88a7b99ab61eab6296eed360f3, <610678d4be94b619c751572e8a58de705592cd07, <4.15, 5.10.265, 6.6.148, 7.2, <9aabda553184346f74810e2ee1d96920b4612e3f

Description

In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free in x25_kill_by_neigh() x25_kill_by_neigh() walks the global X.25 socket list looking for sockets attached to a terminating neighbour. x25_list_lock protects list membership while the lookup is in progress, but it does not pin a socket's lifetime after the lock is dropped. The function currently drops x25_list_lock before calling lock_sock(s). A concurrent close can run x25_release(), remove the same socket from x25_list, and drop the last socket reference in that window. The neighbour teardown path can then lock or inspect a freed struct sock/struct x25_sock. Take sock_hold(s) while x25_list_lock still proves that the list entry is live, then drop the temporary reference after the socket has been locked, rechecked, and released. Recheck x25_sk(s)->neighbour after lock_sock(), because another path may have disconnected the socket before this path acquired the socket lock. Restart the list walk after each disconnect because the list lock was dropped and the previous iterator state may no longer be valid. A QEMU/KASAN run against origin/master reproduced a slab-use-after-free in x25_kill_by_neigh().

Gravité et risque d'exploitation

CVE-2026-68137 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.54 %, ce qui la place devant 44.0 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 5c94b6205e87411dbe9dc1ca088eb36b8837fb47, 9acf05b4e7b55fdb712ef7b331dbce5bcd391d0f, 5.15.33, <=6.1.*, <=6.12.*, <5499e0602d2faafd42c580d25f615903c3fbe11b, 5.18, 6.12.101, <5.10.265, <db6b04f6d65549bb1c7bc8e64a92e7b7d03be676, 409570a619c1cda2e0fde6018a256b9e3d3ba0ee, 0, <5.15.216, 4c240c5a105557e4546d0836e694868f22fd09b0, 7781607938c8371d4c2b243527430241c62e39c2, <=7.1.*, <4.10, 5.15.216, <5.17, <5.18, <4.20, <=5.10.*, <3f4fe26c20c30bd5a2e2583e80685def0b27858c, 4.9.311, <=6.6.*, dffc859d1d9560da594e4282091781b8d2715f00, 4a279d7ee1c65411b4055ecd428b8aa2b1711c1f, 6.18.42, <c98a454d1a9e1bd09d5fd55a7aa589b199340b88, 7.1.6, 5.4.189, 858642789ada1b48630f322e59416ca9fca3e6b7, 6.1.183, <5.5, 671529db75e6be777bb1c76aa07c2bdd2992be6d, <=6.18.*, <ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a, 5.16.19, 5.10.110, 4.14.276, 5.17.2, <=*, 4.19.238, <=5.15.*, <5e8a754ac2009a88a7b99ab61eab6296eed360f3, <610678d4be94b619c751572e8a58de705592cd07, <4.15, 5.10.265, 6.6.148, 7.2, <9aabda553184346f74810e2ee1d96920b4612e3f) 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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