SB2026062590 - Memory leak in Linux kernel net

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-53079)

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: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 a memory leak in qdisc_dequeue_drop() and deferred qdisc drop handling when cleaning up deferred packet drops. A local user can trigger packet drops through a child qdisc whose root qdisc does not implement the TCQ_F_DEQUEUE_DROPS flag to cause a denial of service.

The issue occurs because packets can remain stranded on a child qdisc's local to_free list instead of being freed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76
• https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf