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CVE-2026-43211

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : 0790b89c7e911003b8c50ae50e3ac7645de1fae9, <=6.1.*, <=6.12.*, 81c68e218ab883dfa368460a59b674084c0240da, 0, <fbe06a3058114bf95a17a4941b205f4b321c6f0a, <6.1.165, 7.0, 7253b4fed46471cc247c6cacefac890a8472c083, <bd435f4b738130d732ef64e0e57e45185f77165d, 6.1.165, <9368d1ee62829b08aa31836b3ca003803caf0b72, 5.15.167, df77a678c33871a6e4ac5b54a71662f1d702335b, 6.12.75, 78c6e39fef5c428960aff742149bba302dd46f5a, a4e772898f8bf2e7e1cf661a12c60a5612c4afab, <4.20, 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945, e2355d513b89a2cb511b4ded0deb426cdb01acd0, 6.10.10, <=5.10.*, <=6.6.*, 5.10.226, <=6.19.*, <0425aaf20b407d2f2cf3bf469808e4a35f9abb8b, <5.10.252, <5.5, <=6.18.*, 6.1.110, <943ed56606a7ab2fe5a99cad572dd17d484310c7, 6.6.128, 6.19.6, 5.4.284, 5.10.252, <6.11, 6.11, 6.18.16, <6.6.128, 4.19.322, <=*, <=5.15.*, <ebb27b7399ab8b9eb1f792b329aa5f6250c590d4, <8b08ea9690b212b7bf7f12414039259cf34b1aa0, 6.6.51, 5.15.202, <a19b61fdb958ffadbba85b43c991eb9fc70c1c1c, <5.15.202

Description

In the Linux kernel, the following vulnerability has been resolved: PCI: Fix pci_slot_trylock() error handling Commit a4e772898f8b ("PCI: Add missing bridge lock to pci_bus_lock()") delegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in pci_slot_trylock(), but it forgets to remove the corresponding pci_dev_unlock() when pci_bus_trylock() fails. Before a4e772898f8b, the code did: if (!pci_dev_trylock(dev)) /* <- lock bridge device */ goto unlock; if (dev->subordinate) { if (!pci_bus_trylock(dev->subordinate)) { pci_dev_unlock(dev); /* <- unlock bridge device */ goto unlock; } } After a4e772898f8b the bridge-device lock is no longer taken, but the pci_dev_unlock(dev) on the failure path was left in place, leading to the bug. This yields one of two errors: 1. A warning that the lock is being unlocked when no one holds it. 2. An incorrect unlock of a lock that belongs to another thread. Fix it by removing the now-redundant pci_dev_unlock(dev) on the failure path. [Same patch later posted by Keith at https://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]

Gravité et risque d'exploitation

CVE-2026-43211 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 0.14 %, ce qui la place devant 2.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 0790b89c7e911003b8c50ae50e3ac7645de1fae9, <=6.1.*, <=6.12.*, 81c68e218ab883dfa368460a59b674084c0240da, 0, <fbe06a3058114bf95a17a4941b205f4b321c6f0a, <6.1.165, 7.0, 7253b4fed46471cc247c6cacefac890a8472c083, <bd435f4b738130d732ef64e0e57e45185f77165d, 6.1.165, <9368d1ee62829b08aa31836b3ca003803caf0b72, 5.15.167, df77a678c33871a6e4ac5b54a71662f1d702335b, 6.12.75, 78c6e39fef5c428960aff742149bba302dd46f5a, a4e772898f8bf2e7e1cf661a12c60a5612c4afab, <4.20, 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945, e2355d513b89a2cb511b4ded0deb426cdb01acd0, 6.10.10, <=5.10.*, <=6.6.*, 5.10.226, <=6.19.*, <0425aaf20b407d2f2cf3bf469808e4a35f9abb8b, <5.10.252, <5.5, <=6.18.*, 6.1.110, <943ed56606a7ab2fe5a99cad572dd17d484310c7, 6.6.128, 6.19.6, 5.4.284, 5.10.252, <6.11, 6.11, 6.18.16, <6.6.128, 4.19.322, <=*, <=5.15.*, <ebb27b7399ab8b9eb1f792b329aa5f6250c590d4, <8b08ea9690b212b7bf7f12414039259cf34b1aa0, 6.6.51, 5.15.202, <a19b61fdb958ffadbba85b43c991eb9fc70c1c1c, <5.15.202) 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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