CVE-2021-46977
In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR.
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR. If the MSR holds a different value per logical CPU, the WRMSR could corrupt the host's value if KVM is preempted between the RDMSR and WRMSR, and then rescheduled on a different CPU. Opportunistically land the helper in common x86, SVM will use the helper in a future commit.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089Patch
- https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890Patch
- https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94Patch
- https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bedPatch
- https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089Patch
- https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890Patch
- https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94Patch
- https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bedPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.