CVE-2026-46050

Local RAID10 I/O hang via counter underflow

Published May 27, 2026 · Updated May 27, 2026

Improper locking in Linux Kernel md/raid10 allows local users to hang RAID10 I/O when an array check overlaps NOWAIT requests. raid_end_bio_io reaches allow_barrier, which decrements conf->nr_pending even though the NOWAIT path did not increment that counter. The condition requires concurrent array checking and NOWAIT I/O; the underflow prevents the resync thread and queued requests from passing the barrier.

CVSS severityUnavailable
Unscored
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux Kernel md/raid10 allows local users to hang RAID10 I/O when an array check overlaps NOWAIT requests. raid_end_bio_io reaches allow_barrier, which decrements conf->nr_pending even though the NOWAIT path did not increment that counter. The condition requires concurrent array checking and NOWAIT I/O; the underflow prevents the resync thread and queued requests from passing the barrier.

The record

CVE
CVE-2026-46050
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=10c6021a609deb95f23f0cc2f89aa9d4bffb14c7
  2. Affected versionversion=2941155d9a5ae098b480d551f3a5f8605d4f9af5 <42fe37c90184cd1568838b84b488934c3671c963
  3. Affected versionversion=43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 <1cdff2937c618f81058422bbdc4974a3e7ec9379
  4. Affected versionversion=43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 <7d96f3120a7fb7210d21b520c5b6f495da6ba436
  5. Affected versionversion=43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 <cac2106bb9a2180b288079b49ed626414fb5bc45
  6. Affected versionversion=5.15.189 <5.16
  7. Affected versionversion=6.1.146 <6.2
  8. Affected versionversion=6.12.39 <6.12.86
  9. Affected versionversion=6.15.7 <6.16
  10. Affected versionversion=6.16
  11. Affected versionversion=6.6.99 <6.6.140
  12. Affected versionversion=8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d <965d6162dd88cc7cc193cf7f5bfc132d8bbf0523
  13. Affected versionversion=9af149ca9d0dab6e59e813519d309eff62499864
  14. Affected versionversion=ed7bcd9f617e4107ac0813c516e72e6b8f6029bd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=10c6021a609deb95f23f0cc2f89aa9d4bffb14c7; version=2941155d9a5ae098b480d551f3a5f8605d4f9af5 <42fe37c90184cd1568838b84b488934c3671c963; version=43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 <1cdff2937c618f81058422bbdc4974a3e7ec9379; version=43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 <7d96f3120a7fb7210d21b520c5b6f495da6ba436; version=43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 <cac2106bb9a2180b288079b49ed626414fb5bc45; version=5.15.189 <5.16; version=6.1.146 <6.2; version=6.12.39 <6.12.86; version=6.15.7 <6.16; version=6.16; version=6.6.99 <6.6.140; version=8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d <965d6162dd88cc7cc193cf7f5bfc132d8bbf0523; version=9af149ca9d0dab6e59e813519d309eff62499864; version=ed7bcd9f617e4107ac0813c516e72e6b8f6029bd

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.

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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-667Improper Locking
T1499Endpoint Denial of Service

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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