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CVE-2026-74382

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7, <33373e1f378a501bc51aa73312f74295c84e3101, 0, <=7.1.*, <1387f252a242a51bfbb6eace29c8f8db21b457da, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <a018f208ab7512380bd4cf670064d48cba00a1b1, <=6.18.*, 5.15.212, <3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7, 6.6.145, 5.10.261, 102740bd9436a3a6ba129af3a48271d794009fa5, <10753da2d659dd425a6e620f47f86852d604f67f, <=*, <=5.15.*, <4a76953c3ed043797e81529b9395e9ca6f4c7609, <27db54b90bcc7c37867fe664107fa25ea6a116e4, <4.15, 7.2, 4.15

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_bpf: prevent unbounded recursion in offload rollback Quan Sun reported [1] a stack overflow in cls_bpf_offload_cmd(). Reproducer on netdevsim: add a skip_sw cls_bpf filter, set the bpf_tc_accept debugfs knob to 0, then `tc filter replace`. The replace calls tc_setup_cb_replace() which fails. cls_bpf_offload_cmd() then swaps prog/oldprog and recursively calls itself to roll back. But bpf_tc_accept=0 makes the rollback fail too, which triggers yet another rollback frame with the same arguments, and so on until the stack is exhausted. bpf_tc_accept is just a convenient knob for the reproducer. Any driver whose tc_setup_cb_replace() fails twice in a row can hit the same loop, so this is not a netdevsim-only issue. Two ways to fix it: 1) Have the rollback call tc_setup_cb_add() on oldprog instead of re-entering cls_bpf_offload_cmd(). 2) Mark the rollback frame with a flag and skip a second-level rollback from inside it. Go with (2). It is the smaller change and keeps the original behaviour: the rollback still goes through tc_setup_cb_replace(), so the driver gets one real chance to restore its state. If that attempt also fails, we just return the original error instead of recursing. [1]: https://lore.kernel.org/bpf/ce5a6005-3c5e-4696-9e05-eba9461dc860@std.uestc.edu.cn/T/#u

Gravité et risque d'exploitation

CVE-2026-74382 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.19 %, ce qui la place devant 8.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7, <33373e1f378a501bc51aa73312f74295c84e3101, 0, <=7.1.*, <1387f252a242a51bfbb6eace29c8f8db21b457da, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <a018f208ab7512380bd4cf670064d48cba00a1b1, <=6.18.*, 5.15.212, <3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7, 6.6.145, 5.10.261, 102740bd9436a3a6ba129af3a48271d794009fa5, <10753da2d659dd425a6e620f47f86852d604f67f, <=*, <=5.15.*, <4a76953c3ed043797e81529b9395e9ca6f4c7609, <27db54b90bcc7c37867fe664107fa25ea6a116e4, <4.15, 7.2, 4.15) 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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