What is CVE-2021-3573?

CVE-2021-3573 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.4 out of 10, classified as a Race Condition flaw (CWE-362). CVE-2021-3573 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-3573?

CVE-2021-3573 has a CVSS score of 6.4 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-3573?

No patch is currently available for CVE-2021-3573. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-3573 actively exploited?

CVE-2021-3573 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/362.html

CVE-2021-3573

Medium

A use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system. This flaw affects the Linux kernel versions prior to 5.13-rc5.

Package Linux Kernel

Published 2021-08-13

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

6.4

out of 10

Medium

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-362

CVE-2021-3573 is a Race Condition vulnerability

What is Race Condition?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-3573 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Openwall
http://www.openwall.com/lists/oss-security/2023/07/02/1
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=1966578

Issue Tracking Third Party Advisory
Openwall
https://www.openwall.com/lists/oss-security/2021/06/08/2

Exploit Mailing List Third Party Advisory
Kernel patch commit
https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/commit/?id=e305509e678b3a4af2b3cfd410f409f7cdaabb52
Patch

Details

CVE ID CVE-2021-3573

Severity Medium

CVSS score 6.4 / 10

CVSS version 3.1

Published 2021-08-13

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-3573?

CVE-2021-3573 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.4 out of 10 , classified as a Race Condition flaw (CWE-362) . CVE-2021-3573 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-3573?

CVE-2021-3573 has a CVSS score of 6.4 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-3573?

No patch is currently available for CVE-2021-3573. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-3573 actively exploited?

No — CVE-2021-3573 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. View CWE-362 on MITRE CWE →