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CVE-2026-74398

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.5%
Linux•Linux•Versions : <=6.1.*, 7.1.5, <47b05836705b63dab93d9ac7c69a3a507375ef80, <875c284c0f98b042bb97abad460f63a24c977f88, <8ed0ce9ea58d677d1bac92614ee5f60f8ea57363, <=6.12.*, 6.18.40, c15b1ccadb323ea50023e8f1cca2954129a62b51, <3.11, 0, <=7.1.*, <d21be7d051012c6b572fa4e3334443c250216f7b, <b61af0268e3d1308c466bf0be5dced844eafc1ef, <e889aa99ad3ed48bb0ddcff6475b17542532d18b, <3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, 835b474b8f70fa68d68abffad37378e92f661802, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, 3.14, <3.14, <=*, <=5.15.*, <627ac78f2741e2ebd2225e2e953b6964a8a9182f, 7.2, 3.10.105

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD via addrconf_dad_end(), which drops ifp->lock on return. The lock is re-acquired after net_info_ratelimited(). A concurrent ipv6_del_addr() can take the lock in that window, set ifp->state to DEAD and run list_del_rcu(&ifp->if_list). addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad: and schedules a new dad_work. The work calls ipv6_del_addr() again, hitting the already-poisoned list entry: general protection fault: 0000 [#1] SMP NOPTI CPU: 4 PID: 217 Comm: kworker/4:1 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_del_addr+0xe9/0x280 RAX: dead000000000122 Call Trace: addrconf_dad_stop+0x113/0x140 addrconf_dad_work+0x28c/0x430 process_one_work+0x1eb/0x3b0 worker_thread+0x4d/0x400 kthread+0x104/0x140 ret_from_fork+0x35/0x40 Fold the addrconf_dad_end() logic into addrconf_dad_failure() under a single ifp->lock critical section. The STABLE_PRIVACY branch temporarily drops ifp->lock around address regeneration, so at lock_errdad: verify the state is still POSTDAD before transitioning to ERRDAD; bail out otherwise to avoid overwriting a state set by another path while the lock was released.

Gravité et risque d'exploitation

CVE-2026-74398 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 0.51 %, ce qui la place devant 42.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, <47b05836705b63dab93d9ac7c69a3a507375ef80, <875c284c0f98b042bb97abad460f63a24c977f88, <8ed0ce9ea58d677d1bac92614ee5f60f8ea57363, <=6.12.*, 6.18.40, c15b1ccadb323ea50023e8f1cca2954129a62b51, <3.11, 0, <=7.1.*, <d21be7d051012c6b572fa4e3334443c250216f7b, <b61af0268e3d1308c466bf0be5dced844eafc1ef, <e889aa99ad3ed48bb0ddcff6475b17542532d18b, <3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, 835b474b8f70fa68d68abffad37378e92f661802, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, 3.14, <3.14, <=*, <=5.15.*, <627ac78f2741e2ebd2225e2e953b6964a8a9182f, 7.2, 3.10.105) 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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