SB20260827116 - NULL pointer dereference in Linux kernel net ovpn driver
Published: August 27, 2026
Security Bulletin ID
SB20260827116
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-2026-80520)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/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 ovpn_crypto_kill_key in the ovpn crypto component when handling a request to remove a missing key. A remote attacker can trigger key removal for a key that is not present to cause a denial of service.
A peer may have only one installed key, which can leave one crypto slot empty.
Remediation
Install update from vendor's website.