CVE-2026-31465

Suspend hang via blocked FUSE writeback

Published Apr 22, 2026 · Updated Apr 22, 2026

A writeback deadlock in affected Linux Kernel releases allows local users to hang suspend through a FUSE filesystem. The sync_inodes_sb path waits for flusher threads after initiating dirty-inode writeback even when the FUSE superblock cannot guarantee data persistence. Triggering the hang requires a FUSE daemon that is frozen or fails to complete writeback while the kernel performs suspend-time synchronization.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A writeback deadlock in affected Linux Kernel releases allows local users to hang suspend through a FUSE filesystem. The sync_inodes_sb path waits for flusher threads after initiating dirty-inode writeback even when the FUSE superblock cannot guarantee data persistence. Triggering the hang requires a FUSE daemon that is frozen or fails to complete writeback while the kernel performs suspend-time synchronization.

The record

CVE
CVE-2026-31465
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=0c58a97f919c24fe4245015f4375a39ff05665b6 <5c24a13d8a0466ca0446e58309e51f2606520164
  2. Affected versionversion=0c58a97f919c24fe4245015f4375a39ff05665b6 <76f9377cd2ab7a9220c25d33940d9ca20d368172
  3. Affected versionversion=0c58a97f919c24fe4245015f4375a39ff05665b6 <83800f8ef358ea2fc9b1ae4986b83f2bc24be927
  4. Affected versionversion=6.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0c58a97f919c24fe4245015f4375a39ff05665b6 <5c24a13d8a0466ca0446e58309e51f2606520164; version=0c58a97f919c24fe4245015f4375a39ff05665b6 <76f9377cd2ab7a9220c25d33940d9ca20d368172; version=0c58a97f919c24fe4245015f4375a39ff05665b6 <83800f8ef358ea2fc9b1ae4986b83f2bc24be927; version=6.16

Published CVSS scores

5.5NVDCVSS: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

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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