vulnerability
Ubuntu: (Multiple Advisories) (CVE-2021-29657): Linux kernel (OEM) vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:M/Au:N/C:C/I:C/A:C) | May 11, 2021 | May 12, 2021 | Aug 18, 2025 |
Severity
7
CVSS
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
Published
May 11, 2021
Added
May 12, 2021
Modified
Aug 18, 2025
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.
Solutions
ubuntu-upgrade-linux-image-5-10-0-1026-oemubuntu-upgrade-linux-image-oem-20-04b
References
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