CVE-2021-47008

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.
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

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 : unknown
v3 : unknown
v2 : unknown
v3 : 5.5
CWE CWE-476
References () https://git.kernel.org/stable/c/a3ba26ecfb569f4aa3f867e80c02aa65f20aadad - () https://git.kernel.org/stable/c/a3ba26ecfb569f4aa3f867e80c02aa65f20aadad - Patch
References () https://git.kernel.org/stable/c/fb9e14f4f8217a0980f8da2c8ff70dee058cbe47 - () https://git.kernel.org/stable/c/fb9e14f4f8217a0980f8da2c8ff70dee058cbe47 - Patch
References () https://git.kernel.org/stable/c/fd722a57fe0b80133dacae4e1c852ee4212f9b2e - () 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