CVE-2026-46070

Kernel-memory disclosure and crash via oversized journal payloads

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds read in Linux Kernel md/raid5 allows local users to disclose kernel memory or crash the host via a crafted journal. The r5c_recovery_analyze_meta_block() and r5l_recovery_verify_data_checksum_for_mb() loops trust on-disk payload sizes without checking the remaining metadata-block space. Device-write access is required to plant a valid-CRC malformed journal, which is processed automatically during array assembly.

CVSS severity7.1
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

Out-of-bounds read in Linux Kernel md/raid5 allows local users to disclose kernel memory or crash the host via a crafted journal. The r5c_recovery_analyze_meta_block() and r5l_recovery_verify_data_checksum_for_mb() loops trust on-disk payload sizes without checking the remaining metadata-block space. Device-write access is required to plant a valid-CRC malformed journal, which is processed automatically during array assembly.

The record

CVE
CVE-2026-46070
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
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

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=4.10
  2. Affected versionversion=b4c625c67362b3940f619c1a836b4e8329106658 <33698bd1b2db9764a29df7751533d33967ff5c98
  3. Affected versionversion=b4c625c67362b3940f619c1a836b4e8329106658 <406aa86394ead347c47428fb51b6359bdaa2257d
  4. Affected versionversion=b4c625c67362b3940f619c1a836b4e8329106658 <73ce72edd113374801045924d4417199963f73a3
  5. Affected versionversion=b4c625c67362b3940f619c1a836b4e8329106658 <b0cc3ae97e893bf54bbce447f4e9fd2e0b88bff9
  6. Affected versionversion=b4c625c67362b3940f619c1a836b4e8329106658 <c3a1cf78bd1bbb51b2cc5189b4743056553c1e0e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.10; version=b4c625c67362b3940f619c1a836b4e8329106658 <33698bd1b2db9764a29df7751533d33967ff5c98; version=b4c625c67362b3940f619c1a836b4e8329106658 <406aa86394ead347c47428fb51b6359bdaa2257d; version=b4c625c67362b3940f619c1a836b4e8329106658 <73ce72edd113374801045924d4417199963f73a3; version=b4c625c67362b3940f619c1a836b4e8329106658 <b0cc3ae97e893bf54bbce447f4e9fd2e0b88bff9; version=b4c625c67362b3940f619c1a836b4e8329106658 <c3a1cf78bd1bbb51b2cc5189b4743056553c1e0e

Published CVSS scores

7.1Linux Kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-787Out-of-bounds Write
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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