PT-2026-20431 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-02-21 · CVE-2026-23219

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.19.0-rc7+

Description The Linux kernel contained an issue in the mm/slab subsystem related to memory allocation tagging. Specifically, the alloc tagging slab free hook was not correctly implemented in the memcg alloc abort single path, leading to a warning when memcg slab post alloc hook() failed. This could occur when a specific allocation size was not equal to 1, resulting in the warning message: 'alloc tag was not cleared'. This issue was identified when CONFIG MEM ALLOC PROFILING DEBUG was enabled.

Recommendations Update to a version newer than 6.19.0-rc7+.

Exploit

Fix

Missing Release of Resource after Effective Lifetime

Weakness Enumeration

CWE-772

Related Identifiers

CVE-2026-23219

Affected Products

Linux Kernel

References · 18

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23219.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-23219 · Security Note
• https://osv.dev/vulnerability/CVE-2026-23219 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23219 · Vendor Advisory
• https://git.kernel.org/stable/c/b8bc72587c79fe52c14732e16a766b6eded00707 · Patch
• https://linux.oracle.com/errata/ELSA-2026-50160.html · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23219 · Vendor Advisory
• https://git.kernel.org/stable/c/e6c53ead2d8fa73206e0a63e9cd9aea6bc929837 · Patch
• https://git.kernel.org/stable/c/e8af57e090790983591f6927b3d89ee6383f8c1e · Patch
• https://cve.org/CVERecord?id=CVE-2026-23219 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-23219 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23219 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23219 · Vendor Advisory
• https://twitter.com/CVEnew/status/2024138060880048412 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-23219 · Note