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CVE-2021-29657

HIGH

7.4

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.

Details CVE

Score CVSS v3.17.4

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vecteur d'attaqueLOCAL

ComplexiteHIGH

Privileges requisNONE

Interaction utilisateurNONE

Publie7/22/2021

Derniere modification11/21/2024

Sourcenvd

Observations honeypot0

Produits affectes

linux:linux_kernel

Faiblesses (CWE)

CWE-367CWE-416

References

http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html(cve@mitre.org)

https://bugs.chromium.org/p/project-zero/issues/detail?id=2177(cve@mitre.org)

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12(cve@mitre.org)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134(cve@mitre.org)

https://security.netapp.com/advisory/ntap-20210902-0008/(cve@mitre.org)

http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html(af854a3a-2127-422b-91ae-364da2661108)

https://bugs.chromium.org/p/project-zero/issues/detail?id=2177(af854a3a-2127-422b-91ae-364da2661108)

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12(af854a3a-2127-422b-91ae-364da2661108)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210902-0008/(af854a3a-2127-422b-91ae-364da2661108)

Correlations IOC

Aucune correlation enregistree

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