CVE-2026-23351
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: split gc into unlink and reclaim phase Yiming Qian reports Use-after-free in the pipapo set type: Under a large number of expired elements, commit-time GC can run for a very long time in a non-preemptible context, triggering soft lockup warnings and RCU stall reports (local denial of service). We must split GC in an unlink and a reclaim phase. We cannot queue elements for freeing until pointers have been swapped. Expired elements are still exposed to both the packet path and userspace dumpers via the live copy of the data structure. call_rcu() does not protect us: dump operations or element lookups starting after call_rcu has fired can still observe the free'd element, unless the commit phase has made enough progress to swap the clone and live pointers before any new reader has picked up the old version. This a similar approach as done recently for the rbtree backend in commit 35f83a75529a ("netfilter: nft_set_rbtree: don't gc elements on insert").
Gravité et risque d'exploitation
CVE-2026-23351 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.*, <=6.12.*, 3c4287f62044a90e73a561aa05fc46e62da173da, 0, 7.0, <16f3595c0441d87dfa005c47d8f95be213afaa9e, 6.18.17, 5.6, <9df95785d3d8302f7c066050117b04cd3c2048c2, <=5.10.*, <500a50a301ce962b019ab95053ac70264fec2c21, <=6.6.*, <=6.19.*, <c0f1f85097ac2b6e7d750fe4d05807985cd3fd3a, 5.15.203, <=6.18.*, 6.19.7, 6.1.167, <c12d570d71920903a1a0468b7d13b085203d0c93, <aff13667708dfa0dce136b8efd81baa9fa6ef261, <5.6, <=*, <7864c667aed01a58b87ca518a631322cd0ac34c0, 5.10.253, <=5.15.*, 6.12.77, <65ca51b9fb85477ab92a04295aed34b38f7c062e, 6.6.130) 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
- https://git.kernel.org/stable/c/65ca51b9fb85477ab92a04295aed34b38f7c062e
- https://git.kernel.org/stable/c/c0f1f85097ac2b6e7d750fe4d05807985cd3fd3a
- https://git.kernel.org/stable/c/16f3595c0441d87dfa005c47d8f95be213afaa9e
- https://git.kernel.org/stable/c/7864c667aed01a58b87ca518a631322cd0ac34c0
- https://git.kernel.org/stable/c/c12d570d71920903a1a0468b7d13b085203d0c93
- https://git.kernel.org/stable/c/500a50a301ce962b019ab95053ac70264fec2c21
- https://git.kernel.org/stable/c/aff13667708dfa0dce136b8efd81baa9fa6ef261
- https://git.kernel.org/stable/c/9df95785d3d8302f7c066050117b04cd3c2048c2