SB2026092889 - Deadlock in Linux kernel ipv4
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB2026092889
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Deadlock (CVE-ID: CVE-2026-98103)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to recursive locking in ip_check_mc_rcu() when generating IGMPv3 reports while an XFRM policy matches a multicast destination. A local user can trigger IGMPv3 report generation to cause a denial of service.
The affected function is used in packet receive and route lookup RCU fast paths.
Remediation
Install update from vendor's website.