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CVE-2026-23270

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <524ce8b4ea8f64900b6c52b6a28df74f6bc0801e, <380ad8b7c65ea7aa10ef2258297079ed5ac1f5b6, 5.15.148, <fb3c380a54e33d1fd272cc342faa906d787d7ef1, 0, 0b5b831122fc3789fff75be433ba3e4dd7b779d4, 7.0, <5.15.203, <5a110ddcc99bda77a28598b3555fe009eaab3828, 6.6.14, <9deda0fcda5c1f388c5e279541850b71a2ccfcf4, 6.8, <6.8, 6.1.75, <6.6.130, 73f7da5fd124f2cda9161e2e46114915e6e82e97, <=6.6.*, <=6.19.*, 3f14b377d01d8357eba032b4cabc8c1149b458b6, 5.15.203, 6.18.18, <=6.18.*, 172ba7d46c202e679f3ccb10264c67416aaeb1c4, <6.1.167, 6.1.167, <11cb63b0d1a0685e0831ae3c77223e002ef18189, 6.7.2, f5346df0591d10bc948761ca854b1fae6d2ef441, <=*, <=5.15.*, <bc4e5bb529823a09f02dbe96169de679a9db26e0, 6.12.77, 6.19.8, 6.6.130

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet." act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact). [1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/cc6bfb4a-4a2b-42d8-b9ce-7ef6644fb22b@ovn.org/

Gravité et risque d'exploitation

CVE-2026-23270 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 2.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <524ce8b4ea8f64900b6c52b6a28df74f6bc0801e, <380ad8b7c65ea7aa10ef2258297079ed5ac1f5b6, 5.15.148, <fb3c380a54e33d1fd272cc342faa906d787d7ef1, 0, 0b5b831122fc3789fff75be433ba3e4dd7b779d4, 7.0, <5.15.203, <5a110ddcc99bda77a28598b3555fe009eaab3828, 6.6.14, <9deda0fcda5c1f388c5e279541850b71a2ccfcf4, 6.8, <6.8, 6.1.75, <6.6.130, 73f7da5fd124f2cda9161e2e46114915e6e82e97, <=6.6.*, <=6.19.*, 3f14b377d01d8357eba032b4cabc8c1149b458b6, 5.15.203, 6.18.18, <=6.18.*, 172ba7d46c202e679f3ccb10264c67416aaeb1c4, <6.1.167, 6.1.167, <11cb63b0d1a0685e0831ae3c77223e002ef18189, 6.7.2, f5346df0591d10bc948761ca854b1fae6d2ef441, <=*, <=5.15.*, <bc4e5bb529823a09f02dbe96169de679a9db26e0, 6.12.77, 6.19.8, 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

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