SB20260626131 - Use-after-free in Linux kernel netfilter

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Main Vulnerability Database SB20260626131

SB20260626131 - Use-after-free in Linux kernel netfilter

Published: June 26, 2026

Security Bulletin ID SB20260626131
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-53212)

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 nft_tunnel_obj_destroy() in net/netfilter/nft_tunnel.c when processing packets that still hold a reference to metadata_dst after object destruction. A local user can trigger packet queuing and object destruction to cause a denial of service.

Exploitation requires packets to remain queued, such as in a netem qdisc, until they are later dequeued.


Remediation

Install update from vendor's website.

References