SB2026050862 - Improper control of a resource through its lifetime in Linux kernel mlx5 core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-43464)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper resource management in the mlx5e RX XDP multi-buffer handling for legacy RQ when processing XDP multi-buf programs that modify the XDP buffer layout. A local user can trigger XDP actions that alter buffer fragments to cause a denial of service.

The issue can lead to a negative page fragment reference count during page release.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/03cb50e5b74fce8bf6d92b860371b66253cf0f8d
• https://git.kernel.org/stable/c/a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa
• https://git.kernel.org/stable/c/c74557495efb4bd0adefdfc8678ecdbc82a06da3