UBUNTU-CVE-2020-29534

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    UBUNTU-CVE-2020-29534

    Published: 3 Dec 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-29534
    Aliases:
    USN-4678-1

    Summary:

    Details: An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.

    References: https://ubuntu.com/security/CVE-2020-29534, https://bugs.chromium.org/p/project-zero/issues/detail?id=2089, https://git.kernel.org/linus/0f2122045b946241a9e549c2a76cea54fa58a7ff, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.3, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f2122045b946241a9e549c2a76cea54fa58a7ff, https://ubuntu.com/security/notices/USN-4678-1, https://www.cve.org/CVERecord?id=CVE-2020-29534

    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-2020-29534 | CVE-DB