SB20260720110 - Use-after-free in Linux kernel hsr

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Main Vulnerability Database SB20260720110

SB20260720110 - Use-after-free in Linux kernel hsr

Published: July 20, 2026

Security Bulletin ID SB20260720110
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-2026-64123)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information or cause a denial of service.

The vulnerability exists due to a use-after-free in the hsr node table handling code when processing generic-netlink node-list or node-status operations concurrently with RTM_DELLINK teardown. A local user can trigger concurrent netlink operations to disclose sensitive information or cause a denial of service.

The generic-netlink reader accesses node entries under RCU and may retain a node pointer while teardown frees the same entry.


Remediation

Install update from vendor's website.

References