CVE-2023-53593

Persistent file-access deadlock via leaked folio lock

Published Oct 4, 2025 · Updated Oct 4, 2025

Denial of service in the Linux kernel CIFS client allows local users to deadlock file access when FS-Cache serves a cached read. The cifs_readpage_worker path accepts a successful cifs_readpage_from_fscache return without releasing the folio lock, so later mmap reads wait indefinitely. Exploitation requires a CIFS mount using the non-default FS-Cache option and a cache hit; the resulting deadlock persists until reboot.

CVSS severity5.5
Medium
EPSS probability0.14%
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 the Linux kernel CIFS client allows local users to deadlock file access when FS-Cache serves a cached read. The cifs_readpage_worker path accepts a successful cifs_readpage_from_fscache return without releasing the folio lock, so later mmap reads wait indefinitely. Exploitation requires a CIFS mount using the non-default FS-Cache option and a cache hit; the resulting deadlock persists until reboot.

The record

CVE
CVE-2023-53593
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record 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 <4259dd534245579c966c53c15187cc8e9461d6e9
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a87735675147f848445f05fd1f06168188f91af
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69513dd669e243928f7450893190915a88f84a2b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e74926ede96470be84e66a1c576982fe4f8ea79
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a9fb689c1a1dc373887621a3bfa3810df0abde4
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <961f7ce16223aee2db583a43877d84e6d1f2b857
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e725386d4262ef23ae51993f04602bc535b5be2
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3ac8323f2f5b50e32681c254b8318f7fa2dc3f4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4259dd534245579c966c53c15187cc8e9461d6e9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a87735675147f848445f05fd1f06168188f91af; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69513dd669e243928f7450893190915a88f84a2b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e74926ede96470be84e66a1c576982fe4f8ea79; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a9fb689c1a1dc373887621a3bfa3810df0abde4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <961f7ce16223aee2db583a43877d84e6d1f2b857; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e725386d4262ef23ae51993f04602bc535b5be2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3ac8323f2f5b50e32681c254b8318f7fa2dc3f4

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

No sourced classifications are available.

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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