CVE-2026-68132

Filesystem operation hang via emergency thaw deadlock

Published Aug 10, 2026 · Updated Aug 10, 2026

Deadlock in fs/super.c in affected Linux branches from 4.17 allows local users to hang filesystem operations during emergency thaw. The do_thaw_all_callback() path calls bdev_thaw() while holding s_umount, and fs_bdev_thaw() then tries to acquire the same lock while bd_fsfreeze_mutex remains held. The path requires emergency thaw to process a block device previously frozen through bdev_freeze(), after which unmount, freeze, and thaw operations remain blocked.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in fs/super.c in affected Linux branches from 4.17 allows local users to hang filesystem operations during emergency thaw. The do_thaw_all_callback() path calls bdev_thaw() while holding s_umount, and fs_bdev_thaw() then tries to acquire the same lock while bd_fsfreeze_mutex remains held. The path requires emergency thaw to process a block device previously frozen through bdev_freeze(), after which unmount, freeze, and thaw operations remain blocked.

The record

CVE
CVE-2026-68132
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=08fdc8a0138afaf324296a342f32ad26ec465e43 <4c483644d1a7709efe7d1be7dbf88cf4008a7864
  2. Affected versionversion=08fdc8a0138afaf324296a342f32ad26ec465e43 <63d78b546eefc38ad9898dc839bfc94811ede547
  3. Affected versionversion=08fdc8a0138afaf324296a342f32ad26ec465e43 <749d7aa0377aae32af8c0a4ad43371e7bf830ab5
  4. Affected versionversion=4.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=08fdc8a0138afaf324296a342f32ad26ec465e43 <4c483644d1a7709efe7d1be7dbf88cf4008a7864; version=08fdc8a0138afaf324296a342f32ad26ec465e43 <63d78b546eefc38ad9898dc839bfc94811ede547; version=08fdc8a0138afaf324296a342f32ad26ec465e43 <749d7aa0377aae32af8c0a4ad43371e7bf830ab5; version=4.17

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 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

CWE-833Deadlock
T1499.004Application or System Exploitation

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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