SB2026100666 - Improper locking in Linux kernel xfrm

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026100666

SB2026100666 - Improper locking in Linux kernel xfrm

Published: October 6, 2026

Security Bulletin ID SB2026100666
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-98369)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to trigger kernel RCU lockdep warnings.

The vulnerability exists due to missing RCU read-side locking and insufficient object lifetime management in xfrm_trans_reinject() and xfrm_trans_queue_net() when reinjecting transport-mode packets through a workqueue. A local user can cause transport-mode packets to undergo deferred reinjection to trigger kernel RCU lockdep warnings.

Under CONFIG_PREEMPT_RCU, workqueue workers run in process context where local_bh_disable() does not establish an RCU read-side critical section. Queued packets may carry non-reference-counted destination entries, and network-device unregistration can replace a destination's device with blackhole_netdev.


Remediation

Install update from vendor's website.

References