UBUNTU-CVE-2021-3739

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    UBUNTU-CVE-2021-3739

    Published: 27 Aug 2021Last Modified: 9 Sept 2026
    Upstream:
    CVE-2021-3739
    Aliases:
    USN-5113-1
    USN-5115-1
    USN-5117-1

    Summary:

    Details: A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.

    References: https://ubuntu.com/security/CVE-2021-3739, https://www.openwall.com/lists/oss-security/2021/08/25/3, https://lore.kernel.org/linux-btrfs/[email protected]/T/#u, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091, https://ubuntu.com/security/notices/USN-5113-1, https://ubuntu.com/security/notices/USN-5115-1, https://ubuntu.com/security/notices/USN-5117-1, https://ubuntu.com/security/notices/USN-5137-1, https://ubuntu.com/security/notices/USN-5137-2, https://www.cve.org/CVERecord?id=CVE-2021-3739

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?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-2021-3739 | CVE-DB