CVE-2026-23229

Workload hang via unlocked virtqueue notifications

Published Feb 18, 2026 · Updated Feb 18, 2026

Race condition in Linux Kernel virtio-crypto allows local users to hang concurrent AF_ALG cryptographic workloads on affected systems. virtcrypto_done_task() processes data-virtqueue completion notifications without the required spinlock, allowing concurrent requests to corrupt virtqueue head state. Reachability requires a VM with a virtio-crypto PCI device and built-in backend plus concurrent crypto requests; impact is limited to workload availability.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel virtio-crypto allows local users to hang concurrent AF_ALG cryptographic workloads on affected systems. virtcrypto_done_task() processes data-virtqueue completion notifications without the required spinlock, allowing concurrent requests to corrupt virtqueue head state. Reachability requires a VM with a virtio-crypto PCI device and built-in backend plus concurrent crypto requests; impact is limited to workload availability.

The record

CVE
CVE-2026-23229
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <49c57c6c108931a914ed94e3c0ddb974008260a3
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0a0ded3bb7fd45f720faa48449a930153257d3a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6f0d586808689963e58fd739bed626ff5013b24
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e69a7b0a71b6561b3b6459f1fded8d589f2e8ac2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <49c57c6c108931a914ed94e3c0ddb974008260a3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0a0ded3bb7fd45f720faa48449a930153257d3a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6f0d586808689963e58fd739bed626ff5013b24; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e69a7b0a71b6561b3b6459f1fded8d589f2e8ac2

Published CVSS scores

5.5NIST NVDCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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