CVE-2024-38556: net/mlx5: Add a timeout to acquire the command queue semaphore

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-19 · updated 2026-08-04
Weakness: CWE-129

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Add a timeout to acquire the command queue semaphore Prevent forced completion handling on an entry that has not yet been assigned an index, causing an out of bounds access on idx = -22. Instead of waiting indefinitely for the sem, blocking flow now waits for index to be allocated or a sem acquisition timeout before beginning the timer for FW completion. Kernel log example: mlx5_core 0000:06:00.0: wait_func_handle_exec_timeout:1128:(pid 185911): cmd[-22]: CREATE_UCTX(0xa04) No done completion

Affected products

Linux kernel: from 5.4.174 before 5.5; from 5.10.94 before 5.11; from 5.15.17 before 5.16; from 5.16.3 through 6.1.93; from 6.2 through 6.6.33; from 6.7 through 6.8.12 — fixed in 5.11, 5.16, 5.5

How to fix

Upgrade to a fixed version: Linux kernel 5.11, 5.16, 5.5. Check the vendor advisory for mitigations.

References

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