Informazioni sul CVE-2021-47008
KVM: SVM: Make sure GHCB is mapped before updating
CWE ID: N/A
Base Score (CVSS): N/A
CVE: CVE-2021-47008
Descrizione: 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.
Vettore di attacco
Punteggio CVSS
Il CVSS è un sistema di valutazione che misura la gravità di una vulnerabilità informatica considerando fattori come l’impatto potenziale, la probabilità di attacco e la facilità di esecuzione.
Riassunto: .
Dettaglio del Vettore
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Riferimenti esterni
- https://git.kernel.org/stable/c/fb9e14f4f8217a0980f8da2c8ff70dee058cbe47
- https://git.kernel.org/stable/c/fd722a57fe0b80133dacae4e1c852ee4212f9b2e
- https://git.kernel.org/stable/c/a3ba26ecfb569f4aa3f867e80c02aa65f20aadad
Prodotti interessati
- Linux – Linux
- Linux – Linux