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CVE-2021-3640

Date: March 3, 2022

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.

Severity Score

Related Resources (19)

https://security.netapp.com/advisory/ntap-20220419-0003/
https://ubuntu.com/security/CVE-2021-3640
https://www.openwall.com/lists/oss-security/2021/07/22/1
https://lkml.org/lkml/2021/8/28/238
https://security-tracker.debian.org/tracker/CVE-2021-3640
https://access.redhat.com/errata/RHSA-2022:7444
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951
https://access.redhat.com/errata/RHSA-2022:7683
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
https://access.redhat.com/errata/RHSA-2022:8267
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3640
https://access.redhat.com/security/cve/CVE-2021-3640
https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951
https://access.redhat.com/errata/RHSA-2022:7933
https://nvd.nist.gov/vuln/detail/CVE-2021-3640
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
https://www.debian.org/security/2022/dsa-5096
https://bugzilla.redhat.com/show_bug.cgi?id=1980646
https://www.mend.io/vulnerability-database/CVE-2021-3640

Severity Score

Weakness Type (CWE)

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

Use After Free

CWE-416

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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