CVE-2026-46045

Data corruption via unsynchronized RAID bitmap reads

Published May 27, 2026 · Updated May 27, 2026

Incorrect synchronization in Linux Kernel 6.18.0 through 6.18.26 and 6.19.0 through 7.0.3 allows local users to corrupt RAID data. The md/llbitmap bitmap reader accepts the first nonfaulty assigned member without checking In_sync, so it can consume stale or uninitialized bitmap pages from a rebuilding spare. Reachability requires a Linux MD array with a rebuilding spare and bitmap reads; invalid dirty-bit tracking can corrupt data during recovery or normal operation.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect synchronization in Linux Kernel 6.18.0 through 6.18.26 and 6.19.0 through 7.0.3 allows local users to corrupt RAID data. The md/llbitmap bitmap reader accepts the first nonfaulty assigned member without checking In_sync, so it can consume stale or uninitialized bitmap pages from a rebuilding spare. Reachability requires a Linux MD array with a rebuilding spare and bitmap reads; invalid dirty-bit tracking can corrupt data during recovery or normal operation.

The record

CVE
CVE-2026-46045
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1485
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=5ab829f1971dc99f2aac10846c378e67fc875abc <3115fa2f62970d98f2a639145fb8e2767db8bbf9
  2. Affected versionversion=5ab829f1971dc99f2aac10846c378e67fc875abc <7701e68b5072faa03a8f30b4081dc16df9092381
  3. Affected versionversion=5ab829f1971dc99f2aac10846c378e67fc875abc <98623c7e2a51eab1833c8628d33fa9c6ef3ce325
  4. Affected versionversion=6.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5ab829f1971dc99f2aac10846c378e67fc875abc <3115fa2f62970d98f2a639145fb8e2767db8bbf9; version=5ab829f1971dc99f2aac10846c378e67fc875abc <7701e68b5072faa03a8f30b4081dc16df9092381; version=5ab829f1971dc99f2aac10846c378e67fc875abc <98623c7e2a51eab1833c8628d33fa9c6ef3ce325; version=6.18

Published CVSS scores

6.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
T1485Data Destruction

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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