CVE-2026-31430

HIGH EPSS 0.3%
Published Apr 20, 20262mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 3.1
High
Find Similar
Published Apr 20, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
0.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥6.4  –  <6.6.135
linuxlinux_kernel*≥6.7  –  <6.12.82
linuxlinux_kernel*≥6.13  –  <6.18.23
linuxlinux_kernel*≥6.19  –  <6.19.13
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

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

Remediation

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