SB20260406100 - NULL pointer dereference in Linux kernel net
Published: April 6, 2026
Security Bulletin ID
SB20260406100
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-2026-23439)
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in udp_sock_create6() and its caller fou_create() when handling netlink requests with CONFIG_IPV6 disabled. A local privileged user can send a specially crafted netlink request to cause a denial of service.
Only privileged users can trigger the issue, and exploitation requires a kernel built with CONFIG_IPV6 disabled.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/003343985f26dfefd0c94b1fe1316a2de74428b9
- https://git.kernel.org/stable/c/12aa4b73a67d95bc739995a2d6943aec2f9785c9
- https://git.kernel.org/stable/c/9f036aa0fe46c19e938f03d10e02c23f4fffae5e
- https://git.kernel.org/stable/c/a05a2149386f6dfb4245f522acdbef892acafc84
- https://git.kernel.org/stable/c/b3a6df291fecf5f8a308953b65ca72b7fc9e015d
- https://git.kernel.org/stable/c/ba7c9ddcdd077942b798979edb035207374d4096