SB20260325159 - NULL Pointer Dereference in Linux kernel ipv6
Published: March 25, 2026
Security Bulletin ID
SB20260325159
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 security vulnerability.
1) NULL Pointer Dereference (CVE-ID: CVE-2026-23300)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the IPv6 routing subsystem when handling a standalone IPv6 nexthop object referencing the loopback device. A local user can create a specially crafted IPv6 nexthop and reference it from an IPv4 route to trigger a NULL pointer dereference in __mkroute_output(), leading to a system crash.
Successful exploitation may result in a kernel panic and denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/21ec92774d1536f71bdc90b0e3d052eff99cf093
- https://git.kernel.org/stable/c/8650db85b4259d2885d2a80fbc2317ce24194133
- https://git.kernel.org/stable/c/b299121e7453d23faddf464087dff513a495b4fc
- https://git.kernel.org/stable/c/b3b5a037d520afe3d5276e653bc0ff516bbda34c
- https://git.kernel.org/stable/c/b5062fc2150614c9ea8a611c2e0cb6e047ebfa3a
- https://git.kernel.org/stable/c/f7c9f8e3607440fe39300efbaf46cf7b5eecb23f