PT-2026-33747 · Linux · Linux Kernel

Published 2026-04-20 · Updated 2026-06-05 · CVE-2026-31430

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An out-of-bounds access occurs when parsing X.509 certificates containing empty Basic Constraints or Key Usage extensions. This happens because the first byte of the extension is read before the system verifies its length. An unprivileged user can trigger this issue by submitting a specially crafted certificate to the kernel via the 'keyrings(7)' API.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-31430

OESA-2026-2581

Affected Products

Linux Kernel

References · 118

• https://nvd.nist.gov/vuln/detail/CVE-2025-23145 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31398 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31698 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23473 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-71239 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31628 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31487 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31467 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23102 · Security Note
• https://git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31532 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-71094 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43148 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31518 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31452 · Security Note