UBUNTU-CVE-2021-43057

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    UBUNTU-CVE-2021-43057

    Published: 28 Oct 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-43057
    Aliases:
    USN-5162-1

    Summary:

    Details: An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.

    References: https://ubuntu.com/security/CVE-2021-43057, https://git.kernel.org/linus/a3727a8bac0a9e77c70820655fd8715523ba3db7, https://bugs.chromium.org/p/project-zero/issues/detail?id=2229, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7, https://ubuntu.com/security/notices/USN-5162-1, https://www.cve.org/CVERecord?id=CVE-2021-43057

    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-2021-43057 | CVE-DB