CVE-2018-20836

Description

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.

Category

8.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.11% Top 25%
Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory debian.org Vendor Advisory kernel.org Vendor Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae patch vendor advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16ae patch vendor advisory
http://www.securityfocus.com/bid/108196 vdb entry third party advisory
https://support.f5.com/csp/article/K11225249 third party advisory
https://security.netapp.com/advisory/ntap-20190719-0003/ third party advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html mailing list third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html mailing list third party advisory vendor advisory
https://usn.ubuntu.com/4076-1/ third party advisory vendor advisory
https://www.debian.org/security/2019/dsa-4495 third party advisory vendor advisory
https://seclists.org/bugtraq/2019/Aug/13 third party advisory mailing list
https://seclists.org/bugtraq/2019/Aug/18 third party advisory mailing list
https://www.debian.org/security/2019/dsa-4497 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2018-20836?
CVE-2018-20836 has been scored as a high severity vulnerability.
How to fix CVE-2018-20836?
To fix CVE-2018-20836, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-20836 being actively exploited in the wild?
It is possible that CVE-2018-20836 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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