CVE-2026-45899

Service interruption via uncleared ext4 cache entries

Published May 27, 2026 · Updated May 27, 2026

Improper cache cleanup in Linux Kernel ext4 allows local users to interrupt service when an extent-split operation fails. The failure path in fs/ext4/extents.c returns before removing every processed range, leaving stale entries in the extent status tree. Low-privileged local access and an ext4 workload that reaches the split-error path are required; the documented consequence is limited to system instability and availability loss.

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

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Summary

What happened

Improper cache cleanup in Linux Kernel ext4 allows local users to interrupt service when an extent-split operation fails. The failure path in fs/ext4/extents.c returns before removing every processed range, leaving stale entries in the extent status tree. Low-privileged local access and an ext4 workload that reaches the split-error path are required; the documented consequence is limited to system instability and availability loss.

The record

CVE
CVE-2026-45899
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=0 <5.10.253
  2. Affected versionversion=0 <5.15.203
  3. Affected versionversion=0 <6.12.75
  4. Affected versionversion=0 <6.18.14
  5. Affected versionversion=0 <6.19.4
  6. Affected versionversion=0 <6.6.130
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <120c6bd7ca9d3e80a968b758cbb3fbd67570f132
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <31bf37cf53ede8145e2bc62da803d4506da92975
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <337506dc652383c80839edb8d8dcdd8ff2129b4f
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e54f8dfee359bbd58086c883ea8cffd5312999d
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79b592e8f1b435796cbc2722190368e3e8ffd7a1
  12. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <808f3191498f300174523c54cab101e18795ae4e
  13. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dc7c9b9d03a59a7fe483574531327e650a4b4adc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <5.10.253; version=0 <5.15.203; version=0 <6.12.75; version=0 <6.18.14; version=0 <6.19.4; version=0 <6.6.130; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <120c6bd7ca9d3e80a968b758cbb3fbd67570f132; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <31bf37cf53ede8145e2bc62da803d4506da92975; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <337506dc652383c80839edb8d8dcdd8ff2129b4f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e54f8dfee359bbd58086c883ea8cffd5312999d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79b592e8f1b435796cbc2722190368e3e8ffd7a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <808f3191498f300174523c54cab101e18795ae4e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dc7c9b9d03a59a7fe483574531327e650a4b4adc

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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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