SB2026100760 - Improper locking in Linux kernel bridge

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Main Vulnerability Database SB2026100760

SB2026100760 - Improper locking in Linux kernel bridge

Published: October 7, 2026

Security Bulletin ID SB2026100760
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-98301)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper locking in br_mst_set_state() when processing nonzero MSTI state changes through netlink. A local user can request these state changes to cause a denial of service.

The switchdev_port_attr_set() call invokes a blocking notifier chain that may sleep while an RCU read-side critical section is active. Nonzero MSTI changes are processed with the RTNL lock held.


Remediation

Install update from vendor's website.

References