UBUNTU-CVE-2016-4557

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    UBUNTU-CVE-2016-4557

    Published: 5 May 2016Last Modified: 22 Apr 2026
    Upstream:
    CVE-2016-4557
    Aliases:
    USN-2965-1
    USN-2965-2
    USN-2965-3

    Summary:

    Details: The replace_map_fd_with_map_ptr function in kernel/bpf/verifier.c in the Linux kernel before 4.5.5 does not properly maintain an fd data structure, which allows local users to gain privileges or cause a denial of service (use-after-free) via crafted BPF instructions that reference an incorrect file descriptor.

    References: https://ubuntu.com/security/CVE-2016-4557, https://bugs.chromium.org/p/project-zero/issues/detail?id=808, https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7, http://www.openwall.com/lists/oss-security/2016/05/06/7, https://ubuntu.com/security/notices/USN-2965-1, https://ubuntu.com/security/notices/USN-2965-4, https://ubuntu.com/security/notices/USN-2965-3, https://ubuntu.com/security/notices/USN-2965-2, https://www.cve.org/CVERecord?id=CVE-2016-4557

    Affected packages

    Package

    Name: linux-lts-xenial

    Purl: pkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.4.0-22.39~14.04.1

    Affected versions

    4.4.0-13.29~14.04.1
    4.4.0-14.30~14.04.2
    4.4.0-15.31~14.04.1
    4.4.0-18.34~14.04.1
    4.4.0-21.37~14.04.1

    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