CVE-2021-29657

High

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.

Package Linux Kernel
Published 2021-07-22
Last modified 2024-11-21
CVSS version 3.1
Patch available
Awaiting data

CVSS 3.1 score

7.4

out of 10
High
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-367

CVE-2021-29657 is classified as CWE-367

See CWE-367 on MITRE CWE for full details on this weakness type.

References

5 total

Frequently asked questions

  • What is CVE-2021-29657?

    CVE-2021-29657 is a High severity Linux kernel vulnerability with a CVSS score of 7.4 out of 10 . CVE-2021-29657 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-29657?

    CVE-2021-29657 has a CVSS score of 7.4 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2021-29657?

    Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2021-29657 patch availability.

  • Is CVE-2021-29657 actively exploited?

    No. CVE-2021-29657 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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