PT-2026-20449 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-03-25 · CVE-2026-23223

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 Linux kernel contains a use-after-free issue within the xfs subsystem, specifically in the xchk btree check block owner function. The issue arises from a potential dereference of bs->cur after the memory it points to has been freed, specifically when checking if bs->cur aliases bs->sc->sa.{bno,rmap} cur. The fix involves sampling before type to ensure correct temporal ordering and prevent the dereference after freeing.

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

CVE-2026-23223

ECHO-5BE4-FE6A-842F

OPENSUSE-SU-2026:10387-1

OPENSUSE-SU-2026:20416-1

SUSE-SU-2026:20838-1

SUSE-SU-2026:20931-1

SUSE-SU-2026:21284-1

Affected Products

Linux Kernel

References · 419

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23223.json · Exploit
• https://git.kernel.org/stable/c/1d411278dda293a507cb794db7d9ed3511c685c6 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2026:20838-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23223 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-23223 · Security Note
• https://ubuntu.com/security/CVE-2026-23223 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-50160.html · Vendor Advisory
• https://git.kernel.org/stable/c/ba5264610423d9653aa36920520902d83841bcfd · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23223 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23223 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23223 · Vendor Advisory
• https://git.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217 · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2026:10387-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2026-23223 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23223 · Vendor Advisory