In the Linux kernel, the following vulnerability has been resolved:
KVM: SVM: Make sure GHCB is mapped before updating
Access to the GHCB is mainly in the VMGEXIT path and it is known that the
GHCB will be mapped. But there are two paths where it is possible the GHCB
might not be mapped.
The sev_vcpu_deliver_sipi_vector() routine will update the GHCB to inform
the caller of the AP Reset Hold NAE event that a SIPI has been delivered.
However, if a SIPI is performed without a corresponding AP Reset Hold,
then the GHCB might not be mapped (depending on the previous VMEXIT),
which will result in a NULL pointer dereference.
The svm_complete_emulated_msr() routine will update the GHCB to inform
the caller of a RDMSR/WRMSR operation about any errors. While it is likely
that the GHCB will be mapped in this situation, add a safe guard
in this path to be certain a NULL pointer dereference is not encountered.
References
Configurations
Configuration 1 (hide)
|
History
09 Dec 2024, 18:24
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-476 | |
| References | () https://git.kernel.org/stable/c/a3ba26ecfb569f4aa3f867e80c02aa65f20aadad - Patch | |
| References | () https://git.kernel.org/stable/c/fb9e14f4f8217a0980f8da2c8ff70dee058cbe47 - Patch | |
| References | () https://git.kernel.org/stable/c/fd722a57fe0b80133dacae4e1c852ee4212f9b2e - Patch |
Information
Published : 2024-02-28 09:15
Updated : 2024-12-09 18:24
NVD link : CVE-2021-47008
Mitre link : CVE-2021-47008
CVE.ORG link : CVE-2021-47008
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference