UBUNTU-CVE-2021-26708

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    UBUNTU-CVE-2021-26708

    Published: 5 Feb 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-26708
    Aliases:
    USN-4727-1

    Summary:

    Details: A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.

    References: https://ubuntu.com/security/CVE-2021-26708, https://www.openwall.com/lists/oss-security/2021/02/04/5, https://git.kernel.org/linus/c518adafa39f37858697ac9309c6cf1805581446, http://www.openwall.com/lists/oss-security/2021/02/05/6, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446, https://ubuntu.com/security/notices/USN-4727-1, https://www.cve.org/CVERecord?id=CVE-2021-26708

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    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
    UBUNTU-CVE-2021-26708 | CVE-DB