CVE-2026-31514

Service interruption via EROFS short-read mishandling

Published Apr 22, 2026 · Updated Apr 22, 2026

Improper short-read handling in affected Linux Kernel releases allows local users to interrupt file-backed EROFS I/O. When SIGKILL makes vfs_iocb_iter_read return only the copied byte count, erofs_fileio_ki_complete marks every bio folio uptodate, including unread folios, rather than failing the short-read bio. Exploitation requires local access, a file-backed EROFS mount, and interruption of an in-flight read; the published assessment reports availability impact without confidentiality or integrity impact.

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

Improper short-read handling in affected Linux Kernel releases allows local users to interrupt file-backed EROFS I/O. When SIGKILL makes vfs_iocb_iter_read return only the copied byte count, erofs_fileio_ki_complete marks every bio folio uptodate, including unread folios, rather than failing the short-read bio. Exploitation requires local access, a file-backed EROFS mount, and interruption of an in-flight read; the published assessment reports availability impact without confidentiality or integrity impact.

The record

CVE
CVE-2026-31514
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

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=6.12.75 <6.12.80
  2. Affected versionversion=6.18.14 <6.18.21
  3. Affected versionversion=6.19.4 <6.19.11
  4. Affected versionversion=8d582d65d20bb4796db01b19e86909ad68cb337b <d1ba7d6b3cd1757b108d7b6856c92ae661d6c323
  5. Affected versionversion=bc804a8d7e865ef47fb7edcaf5e77d18bf444ebc <eade54040384f54b7fb330e4b0975c5734850b3c
  6. Affected versionversion=e49abde0ffc382a967b24f326d1614ac3bb06a94 <5cf3972c8221abdb1b464a14ccf8103d840b9085
  7. Affected versionversion=fe4039034dcdf584afbf763787909e28e92a4927 <5a5f23ef5431639db1ac3a0b274aef3a84cc413c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12.75 <6.12.80; version=6.18.14 <6.18.21; version=6.19.4 <6.19.11; version=8d582d65d20bb4796db01b19e86909ad68cb337b <d1ba7d6b3cd1757b108d7b6856c92ae661d6c323; version=bc804a8d7e865ef47fb7edcaf5e77d18bf444ebc <eade54040384f54b7fb330e4b0975c5734850b3c; version=e49abde0ffc382a967b24f326d1614ac3bb06a94 <5cf3972c8221abdb1b464a14ccf8103d840b9085; version=fe4039034dcdf584afbf763787909e28e92a4927 <5a5f23ef5431639db1ac3a0b274aef3a84cc413c

Published CVSS scores

5.5Canonical UbuntuCVSS: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.

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

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

T1499.004Endpoint Denial of Service: Application 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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