Home/CVE/An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_d
CVE

CVE-2018-20836

An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_d

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.

HIGH · CVSS 8.1 EPSS 0.04058
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
▤

Affected Products & Versions

18
linux kernel< 3.16.72
linux kernel>= 3.17 and < 3.18.140
linux kernel>= 3.19 and < 4.4.180
linux kernel>= 4.5 and < 4.9.175
linux kernel>= 4.10 and < 4.14.118
linux kernel>= 4.15 and < 4.19.42
canonical ubuntu linuxall versions
debian linuxall versions
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 May 2019 · 02:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

22
rhsaRHSA-2020:4062Moderate
rhsaRHSA-2020:4060Moderate
suse-csafSUSE-SU-2020:1142-1
suse-csafSUSE-SU-2020:1118-1
suse-csafSUSE-SU-2020:1084-1
🔗

References & Sources

14
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.htmlMailing ListThird Party Advisory
http://www.securityfocus.com/bid/108196Third Party AdvisoryVDB Entry
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16aePatchVendor Advisory
https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16aePatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.htmlMailing ListThird Party Advisory
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