- Description
- In 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.
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- NVD status
- Modified
CVSS 3.1
- Type
- Primary
- Base score
- 6.5
- Impact score
- 4
- Exploitability score
- 2
- Vector string
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- Severity
- MEDIUM
- Hype score
- Not currently trending
CVE-2024-53135 Critical KVM VMX Vulnerability Resolved in Linux Kernel In the Linux kernel, a problem has been fixed. KVM: VMX: Put Intel PT virtualization (guest/host mode) behind CONFIG_BROKEN. They hid KVM's... https://t.co/ZtGhEGFbUn
@VulmonFeeds
5 Dec 2024
41 Impressions
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CVE-2024-53135 In 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… https://t.co/frvhLbqm3m
@CVEnew
4 Dec 2024
197 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
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