{"id":"CVE-2026-43211","title":"PCI: Fix pci_slot_trylock() error handling","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Fix pci_slot_trylock() error handling\n\nCommit a4e772898f8b (\"PCI: Add missing bridge lock to pci_bus_lock()\")\ndelegates the bridge device's pci_dev_trylock() to pc…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e2355d513b89a2cb511b4ded0deb426cdb01acd0 < ebb27b7399ab8b9eb1f792b329aa5f6250c590d4","Linux >= 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945 < fbe06a3058114bf95a17a4941b205f4b321c6f0a","Linux >= 7253b4fed46471cc247c6cacefac890a8472c083 < 943ed56606a7ab2fe5a99cad572dd17d484310c7","Linux >= 78c6e39fef5c428960aff742149bba302dd46f5a < a19b61fdb958ffadbba85b43c991eb9fc70c1c1c","Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < 0425aaf20b407d2f2cf3bf469808e4a35f9abb8b","Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < bd435f4b738130d732ef64e0e57e45185f77165d","Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < 8b08ea9690b212b7bf7f12414039259cf34b1aa0","Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < 9368d1ee62829b08aa31836b3ca003803caf0b72","Linux 0790b89c7e911003b8c50ae50e3ac7645de1fae9","Linux df77a678c33871a6e4ac5b54a71662f1d702335b","Linux 81c68e218ab883dfa368460a59b674084c0240da","Linux >= 5.10.226 < 5.10.252","Linux >= 5.15.167 < 5.15.202","Linux >= 6.1.110 < 6.1.165","Linux >= 6.6.51 < 6.6.128","Linux >= 4.19.322 < 4.20","Linux >= 5.4.284 < 5.5","Linux >= 6.10.10 < 6.11","Linux 6.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:15:46.430223Z"},"published":"2026-05-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:36.671Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43211","references":[{"url":"https://git.kernel.org/stable/c/ebb27b7399ab8b9eb1f792b329aa5f6250c590d4"},{"url":"https://git.kernel.org/stable/c/fbe06a3058114bf95a17a4941b205f4b321c6f0a"},{"url":"https://git.kernel.org/stable/c/943ed56606a7ab2fe5a99cad572dd17d484310c7"},{"url":"https://git.kernel.org/stable/c/a19b61fdb958ffadbba85b43c991eb9fc70c1c1c"},{"url":"https://git.kernel.org/stable/c/0425aaf20b407d2f2cf3bf469808e4a35f9abb8b"},{"url":"https://git.kernel.org/stable/c/bd435f4b738130d732ef64e0e57e45185f77165d"},{"url":"https://git.kernel.org/stable/c/8b08ea9690b212b7bf7f12414039259cf34b1aa0"},{"url":"https://git.kernel.org/stable/c/9368d1ee62829b08aa31836b3ca003803caf0b72"}],"tags":["cve.org"],"epss":0.00136,"epssPercentile":0.02689,"ingestedAt":"2026-10-16T17:24:46.687Z","slug":"CVE-2026-43211","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Fix pci_slot_trylock() error handling\n\nCommit a4e772898f8b (\"PCI: Add missing bridge lock to pci_bus_lock()\")\ndelegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in\npci_slot_trylock(), but it forgets to remove the corresponding\npci_dev_unlock() when pci_bus_trylock() fails.\n\nBefore a4e772898f8b, the code did:\n\n  if (!pci_dev_trylock(dev)) /* <- lock bridge device */\n    goto unlock;\n  if (dev->subordinate) {\n    if (!pci_bus_trylock(dev->subordinate)) {\n      pci_dev_unlock(dev);   /* <- unlock bridge device */\n      goto unlock;\n    }\n  }\n\nAfter a4e772898f8b the bridge-device lock is no longer taken, but the\npci_dev_unlock(dev) on the failure path was left in place, leading to the\nbug.\n\nThis yields one of two errors:\n\n  1. A warning that the lock is being unlocked when no one holds it.\n  2. An incorrect unlock of a lock that belongs to another thread.\n\nFix it by removing the now-redundant pci_dev_unlock(dev) on the failure\npath.\n\n[Same patch later posted by Keith at\nhttps://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]\n\n## Affected\n\n- `Linux >= e2355d513b89a2cb511b4ded0deb426cdb01acd0 < ebb27b7399ab8b9eb1f792b329aa5f6250c590d4`\n- `Linux >= 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945 < fbe06a3058114bf95a17a4941b205f4b321c6f0a`\n- `Linux >= 7253b4fed46471cc247c6cacefac890a8472c083 < 943ed56606a7ab2fe5a99cad572dd17d484310c7`\n- `Linux >= 78c6e39fef5c428960aff742149bba302dd46f5a < a19b61fdb958ffadbba85b43c991eb9fc70c1c1c`\n- `Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < 0425aaf20b407d2f2cf3bf469808e4a35f9abb8b`\n- `Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < bd435f4b738130d732ef64e0e57e45185f77165d`\n- `Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < 8b08ea9690b212b7bf7f12414039259cf34b1aa0`\n- `Linux >= a4e772898f8bf2e7e1cf661a12c60a5612c4afab < 9368d1ee62829b08aa31836b3ca003803caf0b72`\n- `Linux 0790b89c7e911003b8c50ae50e3ac7645de1fae9`\n- `Linux df77a678c33871a6e4ac5b54a71662f1d702335b`\n- `Linux 81c68e218ab883dfa368460a59b674084c0240da`\n- `Linux >= 5.10.226 < 5.10.252`\n- `Linux >= 5.15.167 < 5.15.202`\n- `Linux >= 6.1.110 < 6.1.165`\n- `Linux >= 6.6.51 < 6.6.128`\n- `Linux >= 4.19.322 < 4.20`\n- `Linux >= 5.4.284 < 5.5`\n- `Linux >= 6.10.10 < 6.11`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}