CVE-2025-38047

Local system hang via stale FRED MSRs

Published Jun 18, 2025 · Updated May 11, 2026

Improper state restoration in Linux kernel 6.9 through 6.14.8 allows local users to hang x86 systems during S4 resume with FRED enabled. The resume code transfers control to the image kernel while retaining FRED MSR values initialized by the restore kernel instead of recomputing values for the restored kernel image. Reachability requires a locally initiated hibernation cycle on x86 hardware with FRED enabled; the bounded consequence is a host hang.

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

Improper state restoration in Linux kernel 6.9 through 6.14.8 allows local users to hang x86 systems during S4 resume with FRED enabled. The resume code transfers control to the image kernel while retaining FRED MSR values initialized by the restore kernel instead of recomputing values for the restored kernel image. Reachability requires a locally initiated hibernation cycle on x86 hardware with FRED enabled; the bounded consequence is a host hang.

The record

CVE
CVE-2025-38047
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1188, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=6.9
  2. Affected versionversion=ff45746fbf005f96e42bea466698e3fdbf926013 <c42f740a07eea4807e98d2d8febc549c957a7b49
  3. Affected versionversion=ff45746fbf005f96e42bea466698e3fdbf926013 <e5f1e8af9c9e151ecd665f6d2e36fb25fec3b110
  4. Affected versionversion=ff45746fbf005f96e42bea466698e3fdbf926013 <e7090fe75a2826363c71ad1fb4e95e58141478df

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=ff45746fbf005f96e42bea466698e3fdbf926013 <c42f740a07eea4807e98d2d8febc549c957a7b49; version=ff45746fbf005f96e42bea466698e3fdbf926013 <e5f1e8af9c9e151ecd665f6d2e36fb25fec3b110; version=ff45746fbf005f96e42bea466698e3fdbf926013 <e7090fe75a2826363c71ad1fb4e95e58141478df

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS: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-1188Initialization of a Resource with an Insecure Default
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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