Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.5, < 5.10.38 |
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
FAQ
What is CVE-2021-46977?
CVE-2021-46977 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ...
How severe is CVE-2021-46977?
CVE-2021-46977 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-46977?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.