CVE-2026-23355

Service interruption via stale deferred ATA work

Published Mar 25, 2026 · Updated Mar 25, 2026

Denial of service in affected Linux Kernel versions allows local users to interrupt service through timed ATA command failures. After ap->deferred_qc is cleared during timeout or error recovery, libata leaves queued ata_scsi_deferred_qc_work pending, so stale work can act on a later non-NCQ command while NCQ commands remain in flight. Local access and the specific NCQ/non-NCQ, timeout, reset, and requeue sequence are required; WARN_ON becomes a kernel crash when panic-on-warning behavior is enabled.

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

Denial of service in affected Linux Kernel versions allows local users to interrupt service through timed ATA command failures. After ap->deferred_qc is cleared during timeout or error recovery, libata leaves queued ata_scsi_deferred_qc_work pending, so stale work can act on a later non-NCQ command while NCQ commands remain in flight. Local access and the specific NCQ/non-NCQ, timeout, reset, and requeue sequence are required; WARN_ON becomes a kernel crash when panic-on-warning behavior is enabled.

The record

CVE
CVE-2026-23355
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=0ea84089dbf62a92dc7889c79e6b18fc89260808 <aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9
  2. Affected versionversion=21e0d7a15a789e99be89231dae25cb6ffc482a7c
  3. Affected versionversion=33abac5b5a5303ba2c66d89e063a806033be07fc
  4. Affected versionversion=5d61a38a60e62750526d94663b69b7ac5c7f07a5 <58e658763ba2aa9168d8516b98a6314d7461a53e
  5. Affected versionversion=7.0-rc1
  6. Affected versionversion=888cd7e40adb2ef4af1b4d3b6e2e83ad409ae8c2 <6c5e8f16b5e8e614e829aaf38619bdd79107bb0a
  7. Affected versionversion=ce22aaed011206fed9cbd8c9c2d44718607f31ee <0d12453818c35e1ded84633152c6b05002ae48b9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0ea84089dbf62a92dc7889c79e6b18fc89260808 <aac9b27f7c1f2b2cf7f50a9ca633ecbbcaf22af9; version=21e0d7a15a789e99be89231dae25cb6ffc482a7c; version=33abac5b5a5303ba2c66d89e063a806033be07fc; version=5d61a38a60e62750526d94663b69b7ac5c7f07a5 <58e658763ba2aa9168d8516b98a6314d7461a53e; version=7.0-rc1; version=888cd7e40adb2ef4af1b4d3b6e2e83ad409ae8c2 <6c5e8f16b5e8e614e829aaf38619bdd79107bb0a; version=ce22aaed011206fed9cbd8c9c2d44718607f31ee <0d12453818c35e1ded84633152c6b05002ae48b9

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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