UBUNTU-CVE-2021-47088

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    UBUNTU-CVE-2021-47088

    Published: 4 Mar 2024Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-47088

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: protect targets destructions with kdamond_lock DAMON debugfs interface iterates current monitoring targets in 'dbgfs_target_ids_read()' while holding the corresponding 'kdamond_lock'. However, it also destructs the monitoring targets in 'dbgfs_before_terminate()' without holding the lock. This can result in a use_after_free bug. This commit avoids the race by protecting the destruction with the corresponding 'kdamond_lock'.

    References: https://ubuntu.com/security/CVE-2021-47088, https://git.kernel.org/linus/34796417964b8d0aef45a99cf6c2d20cebe33733, https://git.kernel.org/stable/c/330c6117a82c16a9a365a51cec5c9ab30b13245c, https://git.kernel.org/stable/c/34796417964b8d0aef45a99cf6c2d20cebe33733, https://www.cve.org/CVERecord?id=CVE-2021-47088

    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-2021-47088 | CVE-DB