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Vulnerability record · CVE-2026-31430 · published 20 April 2026

CVE-2026-31430: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.11% · top 98.9% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2 Patch
https://git.kernel.org/stable/c/30ab358fad0c7daa1d282ec48089901b21b36a20 Patch
https://git.kernel.org/stable/c/672b526def1f94c1be8eb11b885b803da0d8c2f1 Patch
https://git.kernel.org/stable/c/7fb4dadc2734f4020d7543d688b8d49c8e569c61 Patch
https://git.kernel.org/stable/c/d702c3408213bb12bd570bb97204d8340d141c51 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31430), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.