CVE-2020-12826

    Dashboard / Vulnerabilities / CVE-2020-12826

    CVE-2020-12826

    Published: 12 May 2020Last Modified: 15 Mar 2026

    Summary:

    Details: A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

    References: https://usn.ubuntu.com/4391-1/, https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html, https://usn.ubuntu.com/4369-1/, https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5, https://security.netapp.com/advisory/ntap-20200608-0001/, https://usn.ubuntu.com/4367-1/, https://www.openwall.com/lists/kernel-hardening/2020/03/25/1, https://bugzilla.redhat.com/show_bug.cgi?id=1822077, https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef, https://lists.openwall.net/linux-kernel/2020/03/24/1803

    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-2020-12826 | CVE-DB