Severity.io | CVE-2021-3640

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.

Related CPE's

o linux linux_kernel ********

o debian debian_linux 9.0 *******

o fedoraproject fedora 34 *******

References

https://github.com/torvalds/linux/commit/99c23da0eed4fd20cae8243f2b51e10e66aa0951

PatchThird Party Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=1980646

Issue TrackingPatchThird Party Advisory

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/bluetooth/sco.c?h=v5.16&id=99c23da0eed4fd20cae8243f2b51e10e66aa0951

PatchVendor Advisory

https://www.openwall.com/lists/oss-security/2021/07/22/1

ExploitMailing ListThird Party Advisory

https://ubuntu.com/security/CVE-2021-3640

PatchThird Party Advisory

[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update

Mailing ListThird Party Advisory

[debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security update

Mailing ListThird Party Advisory

DSA-5096

Third Party Advisory

https://security.netapp.com/advisory/ntap-20220419-0003/

Third Party Advisory

CvssV3 impact

BaseSeverity	HIGH
ConfidentialityImpact	HIGH
AttackComplexity	HIGH
Scope	UNCHANGED
AttackVector	LOCAL
AvailabilityImpact	HIGH
IntegrityImpact	HIGH
PrivilegesRequired	LOW
BaseScore	7
VectorString	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Version	3.1
UserInteraction	NONE

CvssV2 impact

AccessComplexity	MEDIUM
ConfidentialityImpact	COMPLETE
AvailabilityImpact	COMPLETE
IntegrityImpact	COMPLETE
BaseScore	6.900000095367432
VectorString	AV:L/AC:M/Au:N/C:C/I:C/A:C
Version	2.0
AccessVector	LOCAL
Authentication	NONE