UBUNTU-CVE-2021-46998

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    UBUNTU-CVE-2021-46998

    Published: 28 Feb 2024Last Modified: 9 Sept 2026
    Upstream:
    CVE-2021-46998

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb). My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.

    References: https://ubuntu.com/security/CVE-2021-46998, https://git.kernel.org/linus/643001b47adc844ae33510c4bb93c236667008a3, https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976, https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3, https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1, https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3, https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24, https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3, https://www.cve.org/CVERecord?id=CVE-2021-46998

    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-2021-46998 | CVE-DB