CVE-2024-35995

Kernel panic via mis-sized ACPI CPPC access

Published May 20, 2024 · Updated May 11, 2026

Improper system-memory access sizing in affected Linux kernels allows local users to trigger a kernel panic during ACPI CPPC initialization. The CPPC register accessor derives transfer size from bit_width even though ACPI permits non-byte-aligned values, causing an invalid system-memory access instead of using access_width and bit offsets. The path requires ACPI CPPC system-memory register descriptors with this layout; the observed consequence is an asynchronous SError and host crash.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper system-memory access sizing in affected Linux kernels allows local users to trigger a kernel panic during ACPI CPPC initialization. The CPPC register accessor derives transfer size from bit_width even though ACPI permits non-byte-aligned values, causing an invalid system-memory access instead of using access_width and bit offsets. The path requires ACPI CPPC system-memory register descriptors with this layout; the observed consequence is an asynchronous SError and host crash.

The record

CVE
CVE-2024-35995
Published
May 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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=4.9
  2. Affected versionversion=5bbb86aa4b8d84395e42cd05448820651d79f349 <01fc53be672acae37e611c80cc0b4f3939584de3
  3. Affected versionversion=5bbb86aa4b8d84395e42cd05448820651d79f349 <1b890ae474d19800a6be1696df7fb4d9a41676e4
  4. Affected versionversion=5bbb86aa4b8d84395e42cd05448820651d79f349 <2f4a4d63a193be6fd530d180bb13c3592052904c
  5. Affected versionversion=5bbb86aa4b8d84395e42cd05448820651d79f349 <6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=5bbb86aa4b8d84395e42cd05448820651d79f349 <01fc53be672acae37e611c80cc0b4f3939584de3; version=5bbb86aa4b8d84395e42cd05448820651d79f349 <1b890ae474d19800a6be1696df7fb4d9a41676e4; version=5bbb86aa4b8d84395e42cd05448820651d79f349 <2f4a4d63a193be6fd530d180bb13c3592052904c; version=5bbb86aa4b8d84395e42cd05448820651d79f349 <6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1

Published CVSS scores

5.5NIST NVDCVSS: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.

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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

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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