CVE-2026-23047

RBD unmap hang via unset linger pause

Published Feb 4, 2026 · Updated Feb 4, 2026

Denial of service in Linux Kernel allows attackers to hang RBD image unmapping after a prolonged Ceph request pause. The libceph calc_target() path fails to set the paused flag on linger requests, so an affected request never reaches the resend list when processing resumes. The failure requires an unwatch request to time out before a rewatch enters the paused state, leaving watch_mutex held indefinitely.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
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 Linux Kernel allows attackers to hang RBD image unmapping after a prolonged Ceph request pause. The libceph calc_target() path fails to set the paused flag on linger requests, so an affected request never reaches the resend list when processing resumes. The failure requires an unwatch request to time out before a rewatch enters the paused state, leaving watch_mutex held indefinitely.

The record

CVE
CVE-2026-23047
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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 <2b3329b3c29d9e188e40d902d5230c2d5989b940
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d3399c52e0e61720ae898f5a0b5b75d4460ae24
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4ebc711b738d139cabe2fc9e7e7749847676a342
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5647d42c47b535573b63e073e91164d6a5bb058c
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d0dc83cb9a69c1d0bea58f1c430199b05f6b021
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f468f6ff233c6a81e0e761d9124e982903fe9a5
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b3329b3c29d9e188e40d902d5230c2d5989b940; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d3399c52e0e61720ae898f5a0b5b75d4460ae24; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4ebc711b738d139cabe2fc9e7e7749847676a342; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5647d42c47b535573b63e073e91164d6a5bb058c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d0dc83cb9a69c1d0bea58f1c430199b05f6b021; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f468f6ff233c6a81e0e761d9124e982903fe9a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0fe2994f9a9d0a2ec9e42441ea5ba74b6a16176

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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