SB20260625170 - Use-after-free in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-53000)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in netfilter nat hook operations when dumping active netfilter hooks from userspace or handling partial hook exposure on error paths. A local user can trigger hook inspection while freed hook operation structures are still referenced to cause a denial of service.

The issue affects nat hook registration and unregistration paths, including interaction with the nfnetlink hook dump subsystem.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/32fdd2e38e7435a368d88f5977a7d6585ebc8b0e
• https://git.kernel.org/stable/c/3c7511f38ab511b791196b13ae48bf4973bf7dfd
• https://git.kernel.org/stable/c/6eda0d771f94267f73f57c94630aa47e90957915