CVE-2024-35924

Memory disclosure and crash via oversized UCSI reads

Published May 19, 2024 · Updated Aug 5, 2026

Out-of-bounds reads in Linux kernel UCSI 5.5 through 6.6.26 and 6.7 through 6.8.5 allow local users to disclose memory or crash. The UCSI core requests up to the 256-byte UCSI 2.0 MESSAGE_IN size from version 1.2 controllers, reading as many as 240 bytes past their 16-byte region. An unprivileged user can harvest adjacent kernel bytes through world-readable sysfs data, while affected hardware mappings can fault and take the machine down.

CVSS severity7.1
High
EPSS probability0.22%
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 reads in Linux kernel UCSI 5.5 through 6.6.26 and 6.7 through 6.8.5 allow local users to disclose memory or crash. The UCSI core requests up to the 256-byte UCSI 2.0 MESSAGE_IN size from version 1.2 controllers, reading as many as 240 bytes past their 16-byte region. An unprivileged user can harvest adjacent kernel bytes through world-readable sysfs data, while affected hardware mappings can fault and take the machine down.

The record

CVE
CVE-2024-35924
Published
May 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.5
  2. Affected versionversion=bdc62f2bae8fb0e8e99574de5232f0a3c54a27df <0defcaa09d3b21e8387829ee3a652c43fa91e13f
  3. Affected versionversion=bdc62f2bae8fb0e8e99574de5232f0a3c54a27df <266f403ec47573046dee4bcebda82777ce702c40
  4. Affected versionversion=bdc62f2bae8fb0e8e99574de5232f0a3c54a27df <b3db266fb031fba88c423d4bb8983a73a3db6527

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=bdc62f2bae8fb0e8e99574de5232f0a3c54a27df <0defcaa09d3b21e8387829ee3a652c43fa91e13f; version=bdc62f2bae8fb0e8e99574de5232f0a3c54a27df <266f403ec47573046dee4bcebda82777ce702c40; version=bdc62f2bae8fb0e8e99574de5232f0a3c54a27df <b3db266fb031fba88c423d4bb8983a73a3db6527

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System
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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