Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.4, < 6.6.135 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2Patch
- https://git.kernel.org/stable/c/30ab358fad0c7daa1d282ec48089901b21b36a20Patch
- https://git.kernel.org/stable/c/672b526def1f94c1be8eb11b885b803da0d8c2f1Patch
- https://git.kernel.org/stable/c/7fb4dadc2734f4020d7543d688b8d49c8e569c61Patch
- https://git.kernel.org/stable/c/d702c3408213bb12bd570bb97204d8340d141c51Patch
FAQ
What is CVE-2026-31430?
CVE-2026-31430 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 ...
How severe is CVE-2026-31430?
CVE-2026-31430 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31430?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.