UBUNTU-CVE-2021-47040

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-47040

    UBUNTU-CVE-2021-47040

    Published: 28 Feb 2024Last Modified: 6 Aug 2026
    Upstream:
    CVE-2021-47040

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension"). Do that with help of check_<op>_overflow helpers. And fix struct io_provide_buf::len type, as it doesn't make much sense to keep it signed.

    References: https://ubuntu.com/security/CVE-2021-47040, https://git.kernel.org/linus/38134ada0ceea3e848fe993263c0ff6207fd46e7, https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d, https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9, https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03, https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7, https://www.cve.org/CVERecord?id=CVE-2021-47040

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?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-2021-47040 | CVE-DB