CVE-2024-43854

Kernel-memory disclosure via uninitialized integrity metadata

Published Aug 17, 2024 · Updated May 11, 2026

Kernel-memory disclosure in the Linux block layer allows local users to recover uninitialized data written into integrity metadata. bio_integrity_prep allocates write-side integrity metadata with plain kmalloc, leaving prior kernel heap contents in the buffer before it is written to media. Exploitation requires local low-privileged access and a storage path using integrity metadata; non-PI metadata exposes the entire buffer.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel-memory disclosure in the Linux block layer allows local users to recover uninitialized data written into integrity metadata. bio_integrity_prep allocates write-side integrity metadata with plain kmalloc, leaving prior kernel heap contents in the buffer before it is written to media. Exploitation requires local low-privileged access and a storage path using integrity metadata; non-PI metadata exposes the entire buffer.

The record

CVE
CVE-2024-43854
Published
Aug 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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=2.6.27
  2. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <129f95948a96105c1fad8e612c9097763e88ac5f
  3. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <23a19655fb56f241e592041156dfb1c6d04da644
  4. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <3fd11fe4f20756b4c0847f755a64cd96f8c6a005
  5. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <899ee2c3829c5ac14bfc7d3c4a5846c0b709b78f
  6. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <9f4af4cf08f9a0329ade3d938f55d2220c40d0a6
  7. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <cf6b45ea7a8df0f61bded1dc4a8561ac6ad143d2
  8. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <d418313bd8f55c079a7da12651951b489a638ac1
  9. Affected versionversion=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <ebc0e91ba76dc6544fff9f5b66408b1982806a00

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <129f95948a96105c1fad8e612c9097763e88ac5f; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <23a19655fb56f241e592041156dfb1c6d04da644; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <3fd11fe4f20756b4c0847f755a64cd96f8c6a005; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <899ee2c3829c5ac14bfc7d3c4a5846c0b709b78f; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <9f4af4cf08f9a0329ade3d938f55d2220c40d0a6; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <cf6b45ea7a8df0f61bded1dc4a8561ac6ad143d2; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <d418313bd8f55c079a7da12651951b489a638ac1; version=7ba1ba12eeef0aa7113beb16410ef8b7c748e18b <ebc0e91ba76dc6544fff9f5b66408b1982806a00

Published CVSS scores

5.5NISTCVSS: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.

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-401Missing Release of Memory after Effective Lifetime

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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