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CVE-2021-29657

Description

arch/x86/kvm/svm/nested.c in the Linux kernel before 5.11.12 has a use-after-free in which an AMD KVM guest can bypass access control on host OS MSRs when there are nested guests, aka CID-a58d9166a756. This occurs because of a TOCTOU race condition associated with a VMCB12 double fetch in nested_svm_vmrun.

Risk Information

Base Score
7.4
MODERATE
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
Exploitation Probability
0.043

Associated Vulnerability

VulnerabilityOS Platform
Linux kernel for OEM systems (USN-4948-1) linux-image-oem-20.04b_5.10.0.1026.27_amd64.debLinux
Linux kernel for OEM systems (USN-4948-1) linux-image-5.10.0-1026-oem_5.10.0-1026.27_amd64.debLinux
Kernel-uek update (ELSA-2021-9486) kernel-uek-5.4.17-2136.300.7.el8uek.x86_64.rpmLinux
Kernel-uek-debug update (ELSA-2021-9486) kernel-uek-debug-5.4.17-2136.300.7.el8uek.x86_64.rpmLinux
Kernel-uek-debug-devel update (ELSA-2021-9486) kernel-uek-debug-devel-5.4.17-2136.300.7.el8uek.x86_64.rpmLinux
Kernel-uek-devel update (ELSA-2021-9486) kernel-uek-devel-5.4.17-2136.300.7.el8uek.x86_64.rpmLinux
Kernel-uek-doc update (ELSA-2021-9486) kernel-uek-doc-5.4.17-2136.300.7.el8uek.noarch.rpmLinux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234