CVE-2021-3640

 

Published at: - 04-03-2022 12:15

Last modified: - 22-06-2022 05:55

Total changes: - 7

Description

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951
• https://bugzilla.redhat.com/show_bug.cgi?id=1980646
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951
• https://www.openwall.com/lists/oss-security/2021/07/22/1
• https://ubuntu.com/security/CVE-2021-3640
• [debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update-Mailing List, Third Party Advisory
• [debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security update-Mailing List, Third Party Advisory
• DSA-5096-Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220419-0003/

 

Keywords

NVD

 

CVE-2021-3640

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures