MEDIUM 5.5 Microsoft
CVE-2026-23439
udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n
Microsoft Security Update 2026-Apr: udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n
Affected Products
- cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23439
- https://nvd.nist.gov/vuln/detail/CVE-2026-23439
This medium severity vulnerability with a CVSS score of 5.5 was published on 2026-04-14 via Microsoft. Affected: cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0.
vulnfeed aggregates 9166 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.