CVE-2021-33033

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    CVE-2021-33033

    Published: 14 May 2021Last Modified: 14 Mar 2026

    Summary:

    Details: The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.

    References: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08, https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt, https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e

    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
    CVE-2021-33033 | CVE-DB