CVE-2021-47112
x86/kvm: Teardown PV features on boot CPU as well
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
x86/kvm: Teardown PV features on boot CPU as well
Various PV features (Async PF, PV EOI, steal time) work through memory
shared with hypervisor and when we restore from hibernation we must
properly teardown all these features to make sure hypervisor doesn't
write to stale locations after we jump to the previously hibernated kernel
(which can try to place anything there). For secondary CPUs the job is
already done by kvm_cpu_down_prepare(), register syscore ops to do
the same for boot CPU.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/kvm: Desmontaje de funciones PV también en la CPU de arranque Varias funciones PV (Async PF, PV EOI, tiempo de robo) funcionan a través de la memoria compartida con el hipervisor y cuando restauramos desde la hibernación Debemos eliminar adecuadamente todas estas características para asegurarnos de que el hipervisor no escriba en ubicaciones obsoletas después de saltar al kernel previamente hibernado (que puede intentar colocar cualquier cosa allí). Para las CPU secundarias, el trabajo ya lo realiza kvm_cpu_down_prepare(), registre syscore ops para hacer lo mismo para la CPU de arranque.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-03-04 CVE Reserved
- 2024-03-15 CVE Published
- 2024-03-16 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (4)
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.4.125 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.125" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.10.43 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.43" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.12.10 Search vendor "Linux" for product "Linux Kernel" and version " < 5.12.10" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " < 5.13" | en |
Affected
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