CVE-2023-1637

Local memory disclosure via unrestored speculation controls

Published Mar 27, 2023 · Updated Feb 19, 2025

Information disclosure in Linux Kernel before 5.18-rc2 allows local users to read CPU memory after suspend-to-RAM resume. The x86 power-resume path fails to add IA32_SPEC_CTRL and four related mitigation MSRs to the saved context, so the boot CPU resumes without restoring them. Exploitation requires local low-privileged access, an x86 system that completes S3 resume, and a separate speculative-execution path capable of exposing memory; integrity and availability are unaffected.

CVSS severity5.5
Medium
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

Information disclosure in Linux Kernel before 5.18-rc2 allows local users to read CPU memory after suspend-to-RAM resume. The x86 power-resume path fails to add IA32_SPEC_CTRL and four related mitigation MSRs to the saved context, so the boot CPU resumes without restoring them. Exploitation requires local low-privileged access, an x86 system that completes S3 resume, and a separate speculative-execution path capable of exposing memory; integrity and availability are unaffected.

The record

CVE
CVE-2023-1637
Published
Mar 27, 2023
Updated
Feb 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-226, CWE-212
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2025Record 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=Linux kernel 5.18-rc2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel 5.18-rc2

Published CVSS scores

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

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-226Sensitive Information in Resource Not Removed Before Reuse
CWE-212Improper Removal of Sensitive Information Before Storage or Transfer

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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