CVE-2026-46329

Local incorrect-data exposure via EROFS EOF handling

Published Jun 9, 2026 · Updated Jun 9, 2026

Improper I/O completion in Linux Kernel allows local users to receive incorrect data via file-backed EROFS reads past EOF. erofs_fileio_ki_complete() treats a zero-byte backing-file read as successful without advancing and zero-filling the remaining bio, then completes the affected folios. Reachability requires local access to data on an affected file-backed EROFS mount; bytes that should read as zeros can instead contain uncleared data.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper I/O completion in Linux Kernel allows local users to receive incorrect data via file-backed EROFS reads past EOF. erofs_fileio_ki_complete() treats a zero-byte backing-file read as successful without advancing and zero-filling the remaining bio, then completes the affected folios. Reachability requires local access to data on an affected file-backed EROFS mount; bytes that should read as zeros can instead contain uncleared data.

The record

CVE
CVE-2026-46329
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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=6.12
  2. Affected versionversion=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <8d582d65d20bb4796db01b19e86909ad68cb337b
  3. Affected versionversion=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <bc804a8d7e865ef47fb7edcaf5e77d18bf444ebc
  4. Affected versionversion=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <e49abde0ffc382a967b24f326d1614ac3bb06a94
  5. Affected versionversion=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <fe4039034dcdf584afbf763787909e28e92a4927

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <8d582d65d20bb4796db01b19e86909ad68cb337b; version=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <bc804a8d7e865ef47fb7edcaf5e77d18bf444ebc; version=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <e49abde0ffc382a967b24f326d1614ac3bb06a94; version=ce63cb62d794c98c7631c2296fa845f2a8d0a4a1 <fe4039034dcdf584afbf763787909e28e92a4927

Published CVSS scores

5.5NIST NVDCVSS: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

No sourced classifications are available.

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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