UBUNTU-CVE-2021-45402

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    UBUNTU-CVE-2021-45402

    Published: 11 Feb 2022Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-45402

    Summary:

    Details: The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling the mov32 instruction, which allows local users to obtain potentially sensitive address information, aka a "pointer leak."

    References: https://ubuntu.com/security/CVE-2021-45402, https://git.kernel.org/linus/3cf2b61eb06765e27fec6799292d9fb46d0b7e60, https://git.kernel.org/linus/b1a7288dedc6caf9023f2676b4f5ed34cf0d4029, https://git.kernel.org/linus/e572ff80f05c33cd0cb4860f864f5c9c044280b6, https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b1a7288dedc6caf9023f2676b4f5ed34cf0d4029, https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=3cf2b61eb06765e27fec6799292d9fb46d0b7e60, https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e572ff80f05c33cd0cb4860f864f5c9c044280b6, https://ubuntu.com/security/notices/USN-5337-1, https://ubuntu.com/security/notices/USN-5368-1, https://www.cve.org/CVERecord?id=CVE-2021-45402

    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-2021-45402 | CVE-DB