CVE-2024-26810: vfio/pci: Lock external INTx masking ops

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-05 · updated 2026-10-15
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Lock external INTx masking ops Mask operations through config space changes to DisINTx may race INTx configuration changes via ioctl. Create wrappers that add locking for paths outside of the core interrupt code. In particular, irq_type is updated holding igate, therefore testing is_intx() requires holding igate. For example clearing DisINTx from config space can otherwise race changes of the interrupt configuration. This aligns interfaces which may trigger the INTx eventfd into two camps, one side serialized by igate and the other only enabled while INTx is configured. A subsequent patch introduces synchronization for the latter flows.

Affected products

Linux kernel: from 3.6 before 5.4.274; from 5.5 before 5.10.215; from 5.11 before 5.15.154; from 5.16 before 6.1.84; from 6.2 before 6.6.24; from 6.7 before 6.7.12 — fixed in 5.10.215, 5.15.154, 5.4.274, 6.1.84, 6.6.24, 6.7.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.215, 5.15.154, 5.4.274, 6.1.84. Check the vendor advisory for mitigations.

References

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