SB2026061021 - Memory leak in Linux kernel net driver

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-46322)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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 a memory leak in tun_xdp_one() when handling a build_skb() allocation failure. A local user can trigger this error path to cause a denial of service.

The issue occurs because a page allocated for the frame is not freed on the failure path, and the per-buffer error may be discarded during batch processing.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6e
• https://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385
• https://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8
• https://git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5