CVE-2026-93268Public exploitHinoki check available

Filesystem hang via mount-time EA-inode lock cycle

Published Sep 24, 2026 · Updated Sep 24, 2026

Deadlock in the ext4 filesystem in Linux allows local users to hang filesystem activity by mounting a crafted filesystem image. During mount-time orphan cleanup, extra-isize expansion releases an EA inode synchronously while holding an active jbd2 handle and xattr_sem, causing write_inode_now() to reacquire s_writepages_rwsem in a circular lock chain. Reaching the path requires permission to mount an ext4 image containing the relevant orphaned inode or EA-inode state; no network or unprivileged trigger is reported.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Deadlock in the ext4 filesystem in Linux allows local users to hang filesystem activity by mounting a crafted filesystem image. During mount-time orphan cleanup, extra-isize expansion releases an EA inode synchronously while holding an active jbd2 handle and xattr_sem, causing write_inode_now() to reacquire s_writepages_rwsem in a circular lock chain. Reaching the path requires permission to mount an ext4 image containing the relevant orphaned inode or EA-inode state; no network or unprivileged trigger is reported.

The record

CVE
CVE-2026-93268
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.7
  2. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <1dd4882dbdc8bfdf2182fa388883c143fac0902a
  3. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <2fb8ff81659a57c42bb7b49e8339a2be2a318ef8
  4. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <41897f1bcf4ace5f1f28d0be784b6f4f0e929641
  5. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <7461c60b9c6a839b13ad4c3490681a0cf5aa0637
  6. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <7ace189b9ea79cf78df9c32b940ce12735f9459a
  7. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <7ba09330d9ea6e996228316719eae812d7e04983
  8. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <9c3469377b1d8caba6bec6ef3c460810bbfb02cc
  9. Affected versionversion=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <c5e6434cc55f30220b228be237bb666351f9f4dd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <1dd4882dbdc8bfdf2182fa388883c143fac0902a; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <2fb8ff81659a57c42bb7b49e8339a2be2a318ef8; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <41897f1bcf4ace5f1f28d0be784b6f4f0e929641; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <7461c60b9c6a839b13ad4c3490681a0cf5aa0637; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <7ace189b9ea79cf78df9c32b940ce12735f9459a; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <7ba09330d9ea6e996228316719eae812d7e04983; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <9c3469377b1d8caba6bec6ef3c460810bbfb02cc; version=c8585c6fcaf2011de54c3592e80a634a2b9e1a7f <c5e6434cc55f30220b228be237bb666351f9f4dd

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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