UBUNTU-CVE-2024-26686

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    UBUNTU-CVE-2024-26686

    Published: 3 Apr 2024Last Modified: 8 Oct 2026
    Upstream:
    CVE-2024-26686
    Aliases:
    USN-7654-1
    USN-7654-2
    USN-7654-3

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats lock_task_sighand() can trigger a hard lockup. If NR_CPUS threads call do_task_stat() at the same time and the process has NR_THREADS, it will spin with irqs disabled O(NR_CPUS * NR_THREADS) time. Change do_task_stat() to use sig->stats_lock to gather the statistics outside of ->siglock protected section, in the likely case this code will run lockless.

    References: https://ubuntu.com/security/CVE-2024-26686, https://git.kernel.org/linus/7601df8031fd67310af891897ef6cc0df4209305, https://git.kernel.org/stable/c/cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d, https://git.kernel.org/stable/c/27978243f165b44e342f28f449b91327944ea071, https://git.kernel.org/stable/c/7601df8031fd67310af891897ef6cc0df4209305, https://www.cve.org/CVERecord?id=CVE-2024-26686, https://ubuntu.com/security/notices/USN-7654-1, https://ubuntu.com/security/notices/USN-7654-2, https://ubuntu.com/security/notices/USN-7654-3, https://ubuntu.com/security/notices/USN-7655-1, https://ubuntu.com/security/notices/USN-7654-4, https://ubuntu.com/security/notices/USN-7654-5, https://ubuntu.com/security/notices/USN-7686-1, https://ubuntu.com/security/notices/USN-7711-1, https://ubuntu.com/security/notices/USN-7712-1, https://ubuntu.com/security/notices/USN-7712-2

    Affected packages

    Package

    Name: linux

    Purl: pkg:deb/ubuntu/linux?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.11.0-12.19

    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-2024-26686 | CVE-DB