CVE-2018-20836

high-risk
Published 2019-05-07

An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.

Do I need to act?

~
3.8% chance of exploitation in next 30 days
EPSS score — moderate 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
8
CVSS 8.1/10 High
NETWORK / HIGH complexity

Affected Products (17)

Affected Vendors

Debian Linux F5 Canonical Netapp Opensuse

References (28)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
Third Party Advisory http://www.securityfocus.com/bid/108196
Patch https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd...
Patch https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16a...
Mailing List https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
Mailing List https://seclists.org/bugtraq/2019/Aug/13
Mailing List https://seclists.org/bugtraq/2019/Aug/18
Third Party Advisory https://security.netapp.com/advisory/ntap-20190719-0003/
Third Party Advisory https://support.f5.com/csp/article/K11225249
Third Party Advisory https://usn.ubuntu.com/4076-1/
Third Party Advisory https://www.debian.org/security/2019/dsa-4495
Third Party Advisory https://www.debian.org/security/2019/dsa-4497
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
Third Party Advisory http://www.securityfocus.com/bid/108196
Patch https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd...
Patch https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16a...
Mailing List https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html
and 8 more references
50
/ 100
high-risk
Severity 24/34 · High
Exploitability 7/34 · Low
Exposure 19/34 · Moderate