ALT-PU-2021-1639-1
Package kernel-image-un-def updated to version 5.10.28-alt1 for branch p9 in task 269211.
Closed vulnerabilities
Published: 2021-04-01
BDU:2021-04883
Уязвимость компонента arch/x86/kvm/svm/nested.c операционной системы Linux , связанная с использованием памяти после её освобождения, позволяющая нарушителю повысить свои привилегии
Severity: HIGH (7.4)
Vector: AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References:
Published: 2021-07-22
Modified: 2024-11-21
Modified: 2024-11-21
CVE-2021-29657
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.
Severity: HIGH (7.4)
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References:
- http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html
- http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2177
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2177
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134
- https://security.netapp.com/advisory/ntap-20210902-0008/
- https://security.netapp.com/advisory/ntap-20210902-0008/