CVE-2021-46977

KVM: VMX: Disable preemption when probing user return MSRs

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: KVM: VMX: deshabilite la preferencia al sondear los MSR devueltos por el usuario. Deshabilite la preferencia al sondear el MSR devuelto por un usuario a través de RDSMR/WRMSR. Si MSR tiene un valor diferente por CPU lógica, WRMSR podría dañar el valor del host si KVM se adelanta entre RDMSR y WRMSR y luego se reprograma en una CPU diferente. De manera oportunista, coloque el asistente en x86 común, SVM usará el asistente en una confirmación futura.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-27 CVE Reserved
2024-02-28 CVE Published
2024-02-29 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (5)

URL	Tag	Source
https://git.kernel.org/stable/c/4be5341026246870818e28b53202b001426a5aec	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089	2021-05-19
https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94	2021-05-19
https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed	2021-05-19
https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890	2021-05-07

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 < 5.10.38 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.10.38"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 < 5.11.22 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.11.22"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 < 5.12.5 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.12.5"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.13"		en		Affected