Detections
Analytics
CVE-2026-31430
high
Description
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.
References
https://git.kernel.org/stable/c/d702c3408213bb12bd570bb97204d8340d141c51
https://git.kernel.org/stable/c/7fb4dadc2734f4020d7543d688b8d49c8e569c61
https://git.kernel.org/stable/c/672b526def1f94c1be8eb11b885b803da0d8c2f1
https://git.kernel.org/stable/c/30ab358fad0c7daa1d282ec48089901b21b36a20
https://git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2