CVE-2021-3640

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    CVE-2021-3640

    Published: 3 Mar 2022Last Modified: 16 Apr 2026

    Summary:

    Details: A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.

    References: https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html, https://security.netapp.com/advisory/ntap-20220419-0003/, https://www.debian.org/security/2022/dsa-5096, https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html, https://ubuntu.com/security/CVE-2021-3640, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951, https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951, https://bugzilla.redhat.com/show_bug.cgi?id=1980646, https://www.openwall.com/lists/oss-security/2021/07/22/1

    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