KVM: VMX: Bury Intel PT virtualization (guest/host mode) behind CONFIG_BROKEN

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-53135
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-12-04 15:15:13 UTC
Updated2026-08-04 11:21:56 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Bury Intel PT virtualization (guest/host mode) behind CONFIG_BROKEN Hide KVM's pt_mode module param behind CONFIG_BROKEN, i.e. disable support for virtualizing Intel PT via guest/host mode unless BROKEN=y. There are myriad bugs in the implementation, some of which are fatal to the guest, and others which put the stability and health of the host at risk. For guest fatalities, the most glaring issue is that KVM fails to ensure tracing is disabled, and *stays* disabled prior to VM-Enter, which is necessary as hardware disallows loading (the guest's) RTIT_CTL if tracing is enabled (enforced via a VMX consistency check). Per the SDM: If the logical processor is operating with Intel PT enabled (if IA32_RTIT_CTL.TraceEn = 1) at the time of VM entry, the "load IA32_RTIT_CTL" VM-entry control must be 0. On the host side, KVM doesn't validate the guest CPUID configuration provided by userspace, and even worse, uses the guest configuration to decide what MSRs to save/load at VM-Enter and VM-Exit. E.g. configuring guest CPUID to enumerate more address ranges than are supported in hardware will result in KVM trying to passthrough, save, and load non-existent MSRs, which generates a variety of WARNs, ToPA ERRORs in the host, a potential deadlock, etc.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 c3742319d021f5aa3a0a8c828485fee14753f6de git Not specified
CNA Linux Linux affected f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 d4b42f926adcce4e5ec193c714afd9d37bba8e5b git Not specified
CNA Linux Linux affected f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 b8a1d572478b6f239061ee9578b2451bf2f021c2 git Not specified
CNA Linux Linux affected f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 e6716f4230a8784957273ddd27326264b27b9313 git Not specified
CNA Linux Linux affected f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 d28b059ee4779b5102c5da6e929762520510e406 git Not specified
CNA Linux Linux affected f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 b91bb0ce5cd7005b376eac690ec664c1b56372ec git Not specified
CNA Linux Linux affected f99e3daf94ff35dd4a878d32ff66e1fd35223ad6 aa0d42cacf093a6fcca872edc954f6f812926a17 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 5.4.287 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.231 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.174 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.119 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.63 6.6.* semver Not specified
CNA Linux Linux unaffected 6.11.10 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d28b059ee4779b5102c5da6e929762520510e406 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b91bb0ce5cd7005b376eac690ec664c1b56372ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/d4b42f926adcce4e5ec193c714afd9d37bba8e5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b8a1d572478b6f239061ee9578b2451bf2f021c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa0d42cacf093a6fcca872edc954f6f812926a17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c3742319d021f5aa3a0a8c828485fee14753f6de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e6716f4230a8784957273ddd27326264b27b9313 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
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