CVE-2026-43211: PCI: Fix pci_slot_trylock() error handling
In the Linux kernel, the following vulnerability has been resolved:
PCI: Fix pcislottrylock() error handling
Commit a4e772898f8b ("PCI: Add missing bridge lock to pcibuslock()") delegates the bridge device's pcidevtrylock() to pcibustrylock() in pcislottrylock(), but it forgets to remove the corresponding pcidevunlock() when pcibustrylock() fails.
Before a4e772898f8b, the code did:
if (!pcidevtrylock(dev)) / <- lock bridge device / goto unlock; if (dev->subordinate) { if (!pcibustrylock(dev->subordinate)) { pcidevunlock(dev); / <- unlock bridge device / goto unlock; } }
After a4e772898f8b the bridge-device lock is no longer taken, but the pcidevunlock(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 pcidevunlock(dev) on the failure path.
[Same patch later posted by Keith at https://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.8.0-134.134 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1060.63 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.8.0-1063.71 - Upgrade
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ubuntu/linux-azure-fdeto a version that resolves this vulnerability.Fixed in 6.8.0-1062.69 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.8.0-1063.69 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1058.64 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 6.8.0-1045.48 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 6.8.0-1060.61 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-134.134.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1058.61 - Upgrade
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ubuntu/linux-nvidia-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-1058.61.1 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1057.58 - Upgrade
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Event History
Frequently Asked Questions
What is the severity of CVE-2026-43211?
The severity of CVE-2026-43211 has not been explicitly rated, but it addresses an important error handling issue in the Linux kernel.
How do I fix CVE-2026-43211?
To fix CVE-2026-43211, update the Linux kernel to a version that includes the bug fix as mentioned in the commit a4e772898f8b.
Which versions of Linux kernel are affected by CVE-2026-43211?
CVE-2026-43211 affects various Linux kernel versions including 4.19.322 up to 4.20, 5.4.284 up to 5.5, and multiple versions in the 5.x and 6.x series.
What is the impact of CVE-2026-43211 on system security?
CVE-2026-43211 could potentially lead to improper error handling in PCI device management which may impact system stability and security.
Is CVE-2026-43211 related to any specific Linux distributions?
CVE-2026-43211 is related to the Linux kernel and thus affects any distribution that utilizes vulnerable versions of the kernel.