x86/mtrr: Check if fixed MTRRs exist before saving them

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-44948
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-09-04 19:15:29 UTC
Updated2026-05-12 12:17:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/mtrr: Check if fixed MTRRs exist before saving them MTRRs have an obsolete fixed variant for fine grained caching control of the 640K-1MB region that uses separate MSRs. This fixed variant has a separate capability bit in the MTRR capability MSR. So far all x86 CPUs which support MTRR have this separate bit set, so it went unnoticed that mtrr_save_state() does not check the capability bit before accessing the fixed MTRR MSRs. Though on a CPU that does not support the fixed MTRR capability this results in a #GP. The #GP itself is harmless because the RDMSR fault is handled gracefully, but results in a WARN_ON(). Add the missing capability check to prevent this.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 06c1de44d378ec5439db17bf476507d68589bfe9 git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 450b6b22acdaac67a18eaf5ed498421ffcf10051 git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a ca7d00c5656d1791e28369919e3e10febe9c3b16 git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 8aa79dfb216b865e96ff890bc4ea71650f9bc8d7 git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 8a90d3fc7c24608548d3a750671f9dac21d1a462 git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 388f1c954019f253a8383f7eb733f38d541e10b6 git Not specified
CNA Linux Linux affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a 919f18f961c03d6694aa726c514184f2311a4614 git Not specified
CNA Linux Linux affected 2.6.22 Not specified
CNA Linux Linux unaffected 2.6.22 semver Not specified
CNA Linux Linux unaffected 4.19.320 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.282 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.224 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.165 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.105 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.46 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.5 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/10/msg00003.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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