CVE-2018-12896

    Dashboard / Vulnerabilities / CVE-2018-12896

    CVE-2018-12896

    Published: 2 Jul 2018Last Modified: 15 Mar 2026

    Summary:

    Details: An issue was discovered in the Linux kernel through 4.17.3. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random. For example, a local user can cause a denial of service (signed integer overflow) via crafted mmap, futex, timer_create, and timer_settime system calls.

    References: https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html, https://usn.ubuntu.com/3847-1/, https://usn.ubuntu.com/3847-3/, https://usn.ubuntu.com/3848-2/, https://usn.ubuntu.com/3849-2/, https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html, https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html, https://usn.ubuntu.com/3847-2/, https://usn.ubuntu.com/3848-1/, https://usn.ubuntu.com/3849-1/, https://bugzilla.kernel.org/show_bug.cgi?id=200189, https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76, https://github.com/lcytxw/bug_repro/tree/master/bug_200189

    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