CVE-2026-31430
Last modified
CVE-2026-31430 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.. EPSS estimates a 0.08% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 6.4, < 6.6.135 | — |
| Linux | Linux Kernel | >= 6.7, < 6.12.82 | — |
| Linux | Linux Kernel | >= 6.13, < 6.18.23 | — |
| Linux | Linux Kernel | >= 6.19, < 6.19.13 | — |
| Linux | Linux Kernel | 7.0 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-31430?
How severe is CVE-2026-31430?
How do I fix CVE-2026-31430?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-31425In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-31426In the Linux kernel, the following vulnerability has been re…7
- CVE-2026-31427In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-31428In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-31429In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-3143The Total Upkeep – WordPress Backup Plugin plus Restore & Mi…5.3
- CVE-2026-31431In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-31432In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2026-31433In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2026-31434In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-31435In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2026-31436In the Linux kernel, the following vulnerability has been re…9.8
Are you affected by CVE-2026-31430?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST