UBUNTU-CVE-2021-46952

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    UBUNTU-CVE-2021-46952

    Published: 27 Feb 2024Last Modified: 24 Oct 2025
    Upstream:
    CVE-2021-46952

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.

    References: https://ubuntu.com/security/CVE-2021-46952, https://git.kernel.org/linus/c09f11ef35955785f92369e25819bf0629df2e59, https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2, https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897, https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8, https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59, https://www.cve.org/CVERecord?id=CVE-2021-46952

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/[email protected]~16.04.1?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-2021-46952 | CVE-DB