UBUNTU-CVE-2021-28951

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    UBUNTU-CVE-2021-28951

    Published: 20 Mar 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-28951
    Aliases:
    USN-4948-1

    Summary:

    Details: An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.

    References: https://ubuntu.com/security/CVE-2021-28951, https://git.kernel.org/linus/3ebba796fa251d042be42b929a2d916ee5c34a49, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3ebba796fa251d042be42b929a2d916ee5c34a49, https://ubuntu.com/security/notices/USN-4948-1, https://www.cve.org/CVERecord?id=CVE-2021-28951

    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-2021-28951 | CVE-DB