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CVE-2026-80630

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.8%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <097f6fc7b1ae362dd7a9444b2572162fda73b284, eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450, <5.15.212, 0, <=7.1.*, 5.4.297, 342debc12183b51773b3345ba267e9263bdfaaef, e73c838c80dccb9e4f19becc11d9f3cb4a27d483, 7a742a9506849d1c1aa71e36c89855ceddc7d58e, 6.1.178, <0500af8630c3253f0dde879bd3a73a06bb2f2b3f, <=5.10.*, <=6.6.*, 6.12.97, <6.1.178, 6.12.24, 5.15.190, <3e515188393e62a718ccebee651ee74514104ff6, 6.13.12, 6.1.135, cc71a757da78dd4aa1b4a9b19cb011833730ccf2, 4d55144b12e742404bb3f8fee6038bafbf45619d, 6.14.3, <af54df2f44d9605614bc7ed96640302a240a9a62, <5.5, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, 6.15, <5.10.261, <20dd591d8f951e1e6aca5052be8785e6181055e2, <6.6.145, 2f9761a94bae33d26e6a81b31b36e7d776d93dc1, <acc08a0c7f37ebb1901144e03a7cba7d4afd9203, 829c49b6b2ff45b043739168fd1245e4e1a91a30, 5.10.241, <=*, <=5.15.*, <7c09843fd2b44d9bf0de798683861d1aecd62a08, <6.14, <6.15, <6.12.97, <94a5f1efdefb01f82cd228bf4e7ef1e8fc075c80, 7.2, 6.6.88, a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring qlen Whenever fq_codel drops packets during peek, it calls qdisc_tree_reduce_backlog. An issue arises because it calls qdisc_tree_reduce_backlog before it reincrements the qlen. If qlen drops to zero, but peek returns an skb, the parent's qlen_notify callback will be executed even though fq_codel still has 1 packet on the queue and, thus, will mistakenly deactivate the parent's class causing issues like a recent report [1] and a wild memory access in qfq: [ 29.371146][ T360] Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI [ 29.371666][ T360] KASAN: maybe wild-memory-access in range [0xdead000000000120-0xdead000000000127] [ 29.371987][ T360] CPU: 6 UID: 0 PID: 360 Comm: tc Not tainted 7.1.0-rc5-00285-gc530e5b2dbc6-dirty #82 PREEMPT(full) [ 29.372384][ T360] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 29.372620][ T360] RIP: 0010:qfq_deactivate_agg (include/linux/list.h:1029 (discriminator 2) include/linux/list.h:1043 (discriminator 2) net/sched/sch_qfq.c:1369 (discriminator 2) net/sched/sch_qfq.c:1395 (discriminator 2)) sch_qfq [ 29.373544][ T360] RSP: 0018:ffff888102417370 EFLAGS: 00010216 [ 29.373800][ T360] RAX: 0000000000000000 RBX: ffff88811224d568 RCX: dffffc0000000000 [ 29.374079][ T360] RDX: 1ffff11021fe1543 RSI: ffff88810ff0aa00 RDI: dffffc0000000000 [ 29.374368][ T360] RBP: ffff88811224c280 R08: dead000000000122 R09: 1bd5a00000000024 [ 29.374649][ T360] R10: fffffbfff7940329 R11: fffffbfff7940329 R12: 0000000000000000 [ 29.374926][ T360] R13: dead000000000100 R14: ffff88811224d580 R15: ffff88811224d578 [ 29.375207][ T360] FS: 00007f5b794e5780(0000) GS:ffff88815d1e9000(0000) knlGS:0000000000000000 [ 29.375545][ T360] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.375823][ T360] CR2: 000055ffb091f000 CR3: 000000010a305000 CR4: 0000000000750ef0 [ 29.376103][ T360] PKRU: 55555554 [ 29.376258][ T360] Call Trace: [ 29.376401][ T360] <TASK> ... [ 29.376885][ T360] qfq_reset_qdisc (net/sched/sch_qfq.c:357 net/sched/sch_qfq.c:1487) sch_qfq [ 29.377074][ T360] qdisc_reset (net/sched/sch_generic.c:1057) [ 29.377414][ T360] __qdisc_destroy (net/sched/sch_generic.c:1096) [ 29.377600][ T360] qdisc_graft (net/sched/sch_api.c:1062 net/sched/sch_api.c:1053 net/sched/sch_api.c:1159) [ 29.378593][ T360] tc_get_qdisc (net/sched/sch_api.c:1528 net/sched/sch_api.c:1556) Fix this by only calling qdisc_tree_reduce_backlog in peek after the qlen is restored. [1] http://lore.kernel.org/netdev/CAN2cbVe79oj0O9==m4+4x3v+O+qzRagA=2=wkrp9i9=CqYvyZA@mail.gmail.com/

Gravité et risque d'exploitation

CVE-2026-80630 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 0.76 %, ce qui la place devant 54.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <097f6fc7b1ae362dd7a9444b2572162fda73b284, eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450, <5.15.212, 0, <=7.1.*, 5.4.297, 342debc12183b51773b3345ba267e9263bdfaaef, e73c838c80dccb9e4f19becc11d9f3cb4a27d483, 7a742a9506849d1c1aa71e36c89855ceddc7d58e, 6.1.178, <0500af8630c3253f0dde879bd3a73a06bb2f2b3f, <=5.10.*, <=6.6.*, 6.12.97, <6.1.178, 6.12.24, 5.15.190, <3e515188393e62a718ccebee651ee74514104ff6, 6.13.12, 6.1.135, cc71a757da78dd4aa1b4a9b19cb011833730ccf2, 4d55144b12e742404bb3f8fee6038bafbf45619d, 6.14.3, <af54df2f44d9605614bc7ed96640302a240a9a62, <5.5, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, 6.15, <5.10.261, <20dd591d8f951e1e6aca5052be8785e6181055e2, <6.6.145, 2f9761a94bae33d26e6a81b31b36e7d776d93dc1, <acc08a0c7f37ebb1901144e03a7cba7d4afd9203, 829c49b6b2ff45b043739168fd1245e4e1a91a30, 5.10.241, <=*, <=5.15.*, <7c09843fd2b44d9bf0de798683861d1aecd62a08, <6.14, <6.15, <6.12.97, <94a5f1efdefb01f82cd228bf4e7ef1e8fc075c80, 7.2, 6.6.88, a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31) 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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