CVE-2021-4159

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    CVE-2021-4159

    Published: 24 Aug 2022Last Modified: 15 Mar 2026

    Summary:

    Details: A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

    References: https://security-tracker.debian.org/tracker/CVE-2021-4159, https://access.redhat.com/security/cve/CVE-2021-4159, https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html, https://bugzilla.redhat.com/show_bug.cgi?id=2036024, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-4159 | CVE-DB