CVE-2026-80735
HighCVSS 7.3Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, in the ovpn driver, there is a security issue with dereferencing sk_user_data. Some subsystems, like BPF SOCKMAP, set sk_user_data without setting encap_type. It is necessary to ensure the type is the one ovpn expects before dereferencing to avoid out-of-bounds reads.
Risk Assessment
The vulnerability could lead to out-of-bounds memory reads, potentially resulting in information disclosure or system crash. It could be exploited for privilege escalation in BPF environments.
Recommendation
Apply a Linux kernel update containing the fix that checks the type before dereferencing sk_user_data.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ovpn: ensure socket is owned by ovpn before deref sk_user_data Some subsystems, like BPF SOCKMAP, set sk_user_data without actually setting the encap_type. For this reason, we must make sure that the type is the one ovpn expects before dereferencing sk_user_data. Failing to do so may lead to out-of-bounds reads.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS