SB20260912229 - NULL pointer dereference in Linux kernel ipv6
Published: September 12, 2026
Security Bulletin ID
SB20260912229
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-89561)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in ipv6_rpl_srh_rcv() when processing RPL segment routing packets after the receiving interface's IPv6 device pointer has been cleared during an MTU transition. A remote attacker can send RPL segment routing packets during the MTU transition to cause a denial of service.
Remediation
Install update from vendor's website.