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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-43211

PCI: Fix pci_slot_trylock() error handling

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Status
Published
Published
Updated
Assigning organization
Linux

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]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e2355d513b89a2cb511b4ded0deb426cdb01acd0 to < ebb27b7399ab8b9eb1f792b329aa5f6250c590d4affected
  • 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945 to < fbe06a3058114bf95a17a4941b205f4b321c6f0aaffected
  • 7253b4fed46471cc247c6cacefac890a8472c083 to < 943ed56606a7ab2fe5a99cad572dd17d484310c7affected
  • 78c6e39fef5c428960aff742149bba302dd46f5a to < a19b61fdb958ffadbba85b43c991eb9fc70c1c1caffected
  • a4e772898f8bf2e7e1cf661a12c60a5612c4afab to < 0425aaf20b407d2f2cf3bf469808e4a35f9abb8baffected
  • a4e772898f8bf2e7e1cf661a12c60a5612c4afab to < bd435f4b738130d732ef64e0e57e45185f77165daffected
  • a4e772898f8bf2e7e1cf661a12c60a5612c4afab to < 8b08ea9690b212b7bf7f12414039259cf34b1aa0affected
  • a4e772898f8bf2e7e1cf661a12c60a5612c4afab to < 9368d1ee62829b08aa31836b3ca003803caf0b72affected
  • 0790b89c7e911003b8c50ae50e3ac7645de1fae9affected
  • df77a678c33871a6e4ac5b54a71662f1d702335baffected
  • 81c68e218ab883dfa368460a59b674084c0240daaffected
  • 5.10.226 to < 5.10.252affected
  • 5.15.167 to < 5.15.202affected
  • 6.1.110 to < 6.1.165affected
  • 6.6.51 to < 6.6.128affected
  • 4.19.322 to < 4.20affected
  • 5.4.284 to < 5.5affected
  • 6.10.10 to < 6.11affected

Linux Linux

Default version status: affected

  • 6.11affected
  • 0 to < 6.11unaffected
  • 5.10.252 to ≤ 5.10.*unaffected
  • 5.15.202 to ≤ 5.15.*unaffected
  • 6.1.165 to ≤ 6.1.*unaffected
  • 6.6.128 to ≤ 6.6.*unaffected
  • 6.12.75 to ≤ 6.12.*unaffected
  • 6.18.16 to ≤ 6.18.*unaffected
  • 6.19.6 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References