Use After Free Affecting torvalds/linux package, versions [,5.11.12)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.01% (1st percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3006720
  • published26 Jan 2022
  • disclosed22 Jul 2021
  • creditUnknown

Introduced: 22 Jul 2021

CVE-2021-29657  (opens in a new tab)
CWE-367  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 5.11.12 or higher.

Overview

Affected versions of this package are vulnerable to Use After Free 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.

References

CVSS Base Scores

version 3.1