CVE-2026-23219

Local availability impact via uncleared allocation tag

Published Feb 18, 2026 · Updated Feb 18, 2026

Resource-release error in Linux Kernel 6.10 and later affected releases allows local users to interrupt service via slab allocation failure. When __memcg_slab_post_alloc_hook() fails for one object, memcg_alloc_abort_single() frees it without calling alloc_tagging_slab_free_hook(), leaving its allocation tag uncleared. The path matters only with CONFIG_MEM_ALLOC_PROFILING_DEBUG enabled; the stale tag makes the next allocation emit a kernel warning, with no public evidence of data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-release error in Linux Kernel 6.10 and later affected releases allows local users to interrupt service via slab allocation failure. When __memcg_slab_post_alloc_hook() fails for one object, memcg_alloc_abort_single() frees it without calling alloc_tagging_slab_free_hook(), leaving its allocation tag uncleared. The path matters only with CONFIG_MEM_ALLOC_PROFILING_DEBUG enabled; the stale tag makes the next allocation emit a kernel warning, with no public evidence of data disclosure or modification.

The record

CVE
CVE-2026-23219
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.10
  2. Affected versionversion=9f9796b413d3c417f34cae427c4e47bfdd3a7454 <b8bc72587c79fe52c14732e16a766b6eded00707
  3. Affected versionversion=9f9796b413d3c417f34cae427c4e47bfdd3a7454 <e6c53ead2d8fa73206e0a63e9cd9aea6bc929837
  4. Affected versionversion=9f9796b413d3c417f34cae427c4e47bfdd3a7454 <e8af57e090790983591f6927b3d89ee6383f8c1e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.10; version=9f9796b413d3c417f34cae427c4e47bfdd3a7454 <b8bc72587c79fe52c14732e16a766b6eded00707; version=9f9796b413d3c417f34cae427c4e47bfdd3a7454 <e6c53ead2d8fa73206e0a63e9cd9aea6bc929837; version=9f9796b413d3c417f34cae427c4e47bfdd3a7454 <e8af57e090790983591f6927b3d89ee6383f8c1e

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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