CVE-2025-38113

Boot-time panic via uninitialized CPU descriptor

Published Jul 3, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel's ACPI CPPC code allows attackers to crash the system during boot with the nosmp parameter. cppc_allow_fast_switch() iterates over possible CPUs and dereferences each per-CPU cpc_desc_ptr even though nosmp leaves descriptors for offline CPUs uninitialized. Reaching the fault requires control of kernel boot parameters and an ACPI CPPC configuration; the resulting NULL access panics the kernel before normal startup.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel's ACPI CPPC code allows attackers to crash the system during boot with the nosmp parameter. cppc_allow_fast_switch() iterates over possible CPUs and dereferences each per-CPU cpc_desc_ptr even though nosmp leaves descriptors for offline CPUs uninitialized. Reaching the fault requires control of kernel boot parameters and an ACPI CPPC configuration; the resulting NULL access panics the kernel before normal startup.

The record

CVE
CVE-2025-38113
Published
Jul 3, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE 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=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <15eece6c5b05e5f9db0711978c3e3b7f1a2cfe12
  2. Affected versionversion=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <1a677d0ceb4a5d62117b711a8b2e0aee80d33015
  3. Affected versionversion=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <32a48db4cf28ea087214c261da8476db218d08bd
  4. Affected versionversion=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <356d09c7f5bf525086002a34f8bae40b134d1611
  5. Affected versionversion=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <c6dad167aade4bf0bef9130f2f149f4249fc4ad0
  6. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <15eece6c5b05e5f9db0711978c3e3b7f1a2cfe12; version=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <1a677d0ceb4a5d62117b711a8b2e0aee80d33015; version=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <32a48db4cf28ea087214c261da8476db218d08bd; version=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <356d09c7f5bf525086002a34f8bae40b134d1611; version=3cc30dd00a580ca0c9c0b01639841cfd72d10129 <c6dad167aade4bf0bef9130f2f149f4249fc4ad0; version=5.19

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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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