Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-31430

In the Linux kernel, the following vulnerability has been resolved: X.509: Fix out-of-bounds access when parsing extensions Leo reports an out-of-bounds access when parsing a certificate with empty Basic Constraints or Key Usage extension because the first byte of the extension is read before checking its length. Fix it. The bug can be triggered by an unprivileged user by submitting a specially crafted certificate to the kernel through the keyrings(7) API. Leo has demonstrated this with a proof-of-concept program responsibly disclosed off-list.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 0.2%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2026-31430


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