CVE-2021-33034

    Dashboard / Vulnerabilities / CVE-2021-33034

    CVE-2021-33034

    Published: 14 May 2021Last Modified: 16 Apr 2026

    Summary:

    Details: In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/, https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html, https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c4c8c9544099bb9043a10a5318130a943e32fc3, https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl, https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1

    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-2021-33034 | CVE-DB