CVE-2026-45974

Local service interruption via invalid Btrfs leaf access

Published May 27, 2026 · Updated May 27, 2026

Invalid path access in Btrfs quota enablement in Linux Kernel allows local users to interrupt service through a local operation. When btrfs_search_slot_for_read() returns 1 at the end of the reference tree, btrfs_quota_enable() continues and dereferences an invalid path instead of leaving the loop. Local access and low privileges are required, and the reported consequence is limited to availability loss.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid path access in Btrfs quota enablement in Linux Kernel allows local users to interrupt service through a local operation. When btrfs_search_slot_for_read() returns 1 at the end of the reference tree, btrfs_quota_enable() continues and dereferences an invalid path instead of leaving the loop. Local access and low privileges are required, and the reported consequence is limited to availability loss.

The record

CVE
CVE-2026-45974
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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=5.10
  2. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <023545e272f369d487e6a986c1e321c6e04be1da
  3. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <0761447f6f51e1c7997960d8e6559337deed6729
  4. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <1ee1d006c9fe4d6be5527ab1c84216b80cccbe40
  5. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <b2bd557b75b760e4b9d209112bda19314bd64558
  6. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <b5b8ade9da452086e78f5d519b90d3769e354853
  7. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <d7cf2314dd5e8661c05d076cd627eea9a7f76616
  8. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <ecb7c2484cfc83a93658907580035a8adf1e0a92
  9. Affected versionversion=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <fd4913a53e3b54ad7e161847291439fe445d6356
  10. Affected versionversion=5.9.7 <5.10
  11. Affected versionversion=ecce1be9f2a366990d0e75dd249fb324e83c34a9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.10; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <023545e272f369d487e6a986c1e321c6e04be1da; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <0761447f6f51e1c7997960d8e6559337deed6729; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <1ee1d006c9fe4d6be5527ab1c84216b80cccbe40; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <b2bd557b75b760e4b9d209112bda19314bd64558; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <b5b8ade9da452086e78f5d519b90d3769e354853; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <d7cf2314dd5e8661c05d076cd627eea9a7f76616; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <ecb7c2484cfc83a93658907580035a8adf1e0a92; version=5223cc60b40ae525ae6c94e98824129f1a5b4ae5 <fd4913a53e3b54ad7e161847291439fe445d6356; version=5.9.7 <5.10; version=ecce1be9f2a366990d0e75dd249fb324e83c34a9

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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