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    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.

    Published:Mar 31, 2021
    Last Modified:Nov 21, 2024
    EPS:Jul 22, 2021
    EPSS Score:0.00037
    CVSS Score:7.4

    Affected Products

    Vendor
    Linux
    Product
    Linux Kernel

    Exploits

    https://bugs.chromium.org/p/project-zero/issues/detail?id=2177https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12https://bugs.chromium.org/p/project-zero/issues/detail?id=2177https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High