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Vulnerability record · CVE-2018-20836 · published 7 May 2019

CVE-2018-20836: Linux kernel race condition vulnerability

Linux · Linux Kernel

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.

8.1 CVSS 3.1 High EPSS 5.1% · top 7.9% CWE-362 · Race conditionCWE-416 · Use after free
8.1CVSS 3.1 base score, v2 9.3
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
13Affected product versions listed by NVD
28References
17 Jun 2026Last modified by NVD

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.

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

Affected products

13 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/108196 Third Party AdvisoryVDB Entry
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16ae PatchVendor Advisory
https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Aug/13 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Aug/18 Mailing ListThird 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 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/108196 Third Party AdvisoryVDB Entry
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16ae PatchVendor Advisory
https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Aug/13 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Aug/18 Mailing ListThird 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 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-20836), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.