CVE-2019-18683

moderate-risk
Published 2019-11-04

An issue was discovered in drivers/media/platform/vivid in the Linux kernel through 5.3.8. It is exploitable for privilege escalation on some Linux distributions where local users have /dev/video0 access, but only if the driver happens to be loaded. There are multiple race conditions during streaming stopping in this driver (part of the V4L2 subsystem). These issues are caused by wrong mutex locking in vivid_stop_generating_vid_cap(), vivid_stop_generating_vid_out(), sdr_cap_stop_streaming(), and the corresponding kthreads. At least one of these race conditions leads to a use-after-free.

Do I need to act?

-
1.00% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.0/10 High
LOCAL / HIGH complexity

Affected Products (20)

8300 Firmware
8700 Firmware
A400 Firmware

Affected Vendors

Debian Linux Broadcom Canonical Netapp Opensuse

References (28)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html
Third Party Advisory http://packetstormsecurity.com/files/155890/Slackware-Security-Advisory-Slackwar...
Exploit http://www.openwall.com/lists/oss-security/2019/11/05/1
Mailing List https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
Vendor Advisory https://lore.kernel.org/lkml/20191103221719.27118-1-alex.popov%40linux.com/
Mailing List https://seclists.org/bugtraq/2020/Jan/10
Third Party Advisory https://security.netapp.com/advisory/ntap-20191205-0001/
Third Party Advisory https://usn.ubuntu.com/4254-1/
Third Party Advisory https://usn.ubuntu.com/4254-2/
Third Party Advisory https://usn.ubuntu.com/4258-1/
Third Party Advisory https://usn.ubuntu.com/4284-1/
Third Party Advisory https://usn.ubuntu.com/4287-1/
Third Party Advisory https://usn.ubuntu.com/4287-2/
Exploit https://www.openwall.com/lists/oss-security/2019/11/02/1
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html
Third Party Advisory http://packetstormsecurity.com/files/155890/Slackware-Security-Advisory-Slackwar...
Exploit http://www.openwall.com/lists/oss-security/2019/11/05/1
Mailing List https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
Vendor Advisory https://lore.kernel.org/lkml/20191103221719.27118-1-alex.popov%40linux.com/
Mailing List https://seclists.org/bugtraq/2020/Jan/10
and 8 more references
41
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 3/34 · Minimal
Exposure 20/34 · Moderate