CVE-2024-50279

Kernel-memory disclosure via dirty-bitset index error

Published Nov 19, 2024 · Updated May 11, 2026

Out-of-bounds read in Linux dm-cache allows local users to disclose kernel memory or interrupt the system during a fast-device shrink. In cache_preresume, dirty-bitset iteration advances the cache-block index at the wrong point and reads offset 0x80 beyond a 128-byte bitset. Triggering the flaw requires local access to suspend, reload, and resume a configured device-mapper cache while reducing its fast device.

CVSS severity7.1
High
EPSS probability0.26%
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 dm-cache allows local users to disclose kernel memory or interrupt the system during a fast-device shrink. In cache_preresume, dirty-bitset iteration advances the cache-block index at the wrong point and reads offset 0x80 beyond a 128-byte bitset. Triggering the flaw requires local access to suspend, reload, and resume a configured device-mapper cache while reducing its fast device.

The record

CVE
CVE-2024-50279
Published
Nov 19, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 19, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.13
  2. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <3b02c40ff10fdf83cc545850db208de855ebe22c
  3. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <4fa4feb873cea0e9d6ff883b37cca6f33169d8b4
  4. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <56507203e1b6127967ec2b51fb0b23a0d4af1334
  5. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <792227719725497ce10a8039803bec13f89f8910
  6. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <8501e38dc9e0060814c4085815fc83da3e6d43bf
  7. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <e57648ce325fa405fe6bbd0e6a618ced7c301a2d
  8. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <ee1f74925717ab36f6a091104c170639501ce818
  9. Affected versionversion=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.13; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <3b02c40ff10fdf83cc545850db208de855ebe22c; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <4fa4feb873cea0e9d6ff883b37cca6f33169d8b4; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <56507203e1b6127967ec2b51fb0b23a0d4af1334; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <792227719725497ce10a8039803bec13f89f8910; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <8501e38dc9e0060814c4085815fc83da3e6d43bf; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <e57648ce325fa405fe6bbd0e6a618ced7c301a2d; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <ee1f74925717ab36f6a091104c170639501ce818; version=f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 <ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f

Published CVSS scores

7.1CISA ADPCVSS: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-125Out-of-bounds Read
T1499.004Application 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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