SB2026082465 - Out-of-bounds read in Linux kernel mlx5 core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-74712)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in create_direct_keys() when calculating command input buffer lengths for mlx5 vDPA direct key creation. A local user can trigger the vulnerable code path to cause a denial of service.

The issue is caused by a mismatch between the input buffer pointer and the calculated input size, which can lead to a read beyond the allocated slab buffer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430
• https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12
• https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5
• https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2