CVE-2026-64356

Local denial of service via XFS resource leaks

Published Jul 25, 2026 · Updated Jul 25, 2026

Resource leak in the XFS metadir quota-inode path in Linux Kernel 6.13 through 7.1.1 allows local users to hang mount setup. xfs_dqinode_metadir_create() returns directly when xfs_metadir_create() fails, retaining update and transaction state; a later commit failure also leaves a caller-owned inode reference unreleased. Reachability requires XFS metadir quota-inode creation to hit either failure path, and repeated leaks can exhaust resources and leave the system unresponsive.

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

Resource leak in the XFS metadir quota-inode path in Linux Kernel 6.13 through 7.1.1 allows local users to hang mount setup. xfs_dqinode_metadir_create() returns directly when xfs_metadir_create() fails, retaining update and transaction state; a later commit failure also leaves a caller-owned inode reference unreleased. Reachability requires XFS metadir quota-inode creation to hit either failure path, and repeated leaks can exhaust resources and leave the system unresponsive.

The record

CVE
CVE-2026-64356
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=6.13
  2. Affected versionversion=e80fbe1ad8eff7d7d1363e14f1e493d84dd37c84 <06a2e6dbaa26c0740ac76dfa66b0aedc78d05820
  3. Affected versionversion=e80fbe1ad8eff7d7d1363e14f1e493d84dd37c84 <45de375b25060edf46e20abb36521ba530336ceb
  4. Affected versionversion=e80fbe1ad8eff7d7d1363e14f1e493d84dd37c84 <c3d3d2212c2966973dd7d603c6c6e6ed6fc7fbe1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.13; version=e80fbe1ad8eff7d7d1363e14f1e493d84dd37c84 <06a2e6dbaa26c0740ac76dfa66b0aedc78d05820; version=e80fbe1ad8eff7d7d1363e14f1e493d84dd37c84 <45de375b25060edf46e20abb36521ba530336ceb; version=e80fbe1ad8eff7d7d1363e14f1e493d84dd37c84 <c3d3d2212c2966973dd7d603c6c6e6ed6fc7fbe1

Published CVSS scores

5.5Red HatCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

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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