SB20260815231 - Use-after-free in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72493)

CWE-ID: CWE-416 - Use After Free

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 attacker to cause a denial of service.

The vulnerability exists due to a race condition leading to use-after-free in enqueue_to_backlog() when processing packets during device unregistration. A local attacker can trigger packet transmission during device unregistration to cause a denial of service.

The issue occurs because a packet can escape backlog flushing during network namespace exit or similar device unregistration timing.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2fface6e0bbd6314d1d9d071abf2c4d67548511c
• https://git.kernel.org/stable/c/46762cefe7f4e5bffc1eb467810a7bbb02e461d7