PT-2026-20447 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-04-20 · CVE-2026-23221

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description The driver override show() function in the Linux kernel can experience a use-after-free condition. This occurs because the function reads the driver override string without acquiring the device lock. Simultaneously, the driver override store() function modifies and frees this string while holding the device lock. If the store function frees the string while the show function is reading it, a concurrent use-after-free issue arises. The fix involves acquiring the device lock around the read operation.

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

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

AZL-77930

CVE-2026-23221

ECHO-C9A4-BB6B-0B13

OESA-2026-1760

OPENSUSE-SU-2026:10387-1

OPENSUSE-SU-2026:20416-1

SUSE-SU-2026:0962-1

SUSE-SU-2026:1081-1

SUSE-SU-2026:20667-1

SUSE-SU-2026:20720-1

SUSE-SU-2026:20838-1

SUSE-SU-2026:20845-1

SUSE-SU-2026:20876-1

SUSE-SU-2026:20931-1

SUSE-SU-2026:21284-1

Affected Products

Linux Kernel

References · 1720

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23221.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-71134 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68818 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68265 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68378 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-40215 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-71072 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23208 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2026-23221 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-40346 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68173 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-22978 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68259 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23230 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-68349 · Security Note