CVE-2021-20263

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    CVE-2021-20263

    Published: 9 Mar 2021Last Modified: 15 Mar 2026

    Summary:

    Details: A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.

    References: https://security.gentoo.org/glsa/202208-27, https://security.netapp.com/advisory/ntap-20210507-0002/, https://www.openwall.com/lists/oss-security/2021/03/08/1, https://bugzilla.redhat.com/show_bug.cgi?id=1933668

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-20263 | CVE-DB