UBUNTU-CVE-2021-38166

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    UBUNTU-CVE-2021-38166

    Published: 7 Aug 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-38166

    Summary:

    Details: In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without the CAP_SYS_ADMIN capability.

    References: https://ubuntu.com/security/CVE-2021-38166, https://lore.kernel.org/bpf/[email protected]/, https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6, https://ubuntu.com/security/notices/USN-5096-1, https://ubuntu.com/security/notices/USN-5113-1, https://ubuntu.com/security/notices/USN-5115-1, https://www.cve.org/CVERecord?id=CVE-2021-38166

    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-2021-38166 | CVE-DB