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UBUNTU-CVE-2018-20836 High

UBUNTU-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_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.

Exploit probability Not scored
Published May 7, 2019
Required by Not available
Last source change August 18, 2026

02 / AFFECTED SOFTWARE

Affected packages

Ubuntu:14.04:LTS linux-azure

6 explicit affected versions

Ubuntu:16.04:LTS linux

94 explicit affected versions

Ubuntu:16.04:LTS linux-aws

54 explicit affected versions

Ubuntu:16.04:LTS linux-aws-hwe

2 explicit affected versions

Ubuntu:16.04:LTS linux-azure

29 explicit affected versions

Ubuntu:16.04:LTS linux-gcp

25 explicit affected versions

Ubuntu:16.04:LTS linux-hwe

45 explicit affected versions

Ubuntu:16.04:LTS linux-kvm

32 explicit affected versions

Ubuntu:16.04:LTS linux-raspi2

66 explicit affected versions

Ubuntu:16.04:LTS linux-snapdragon

64 explicit affected versions

Ubuntu:18.04:LTS linux

23 explicit affected versions

Ubuntu:18.04:LTS linux-aws

18 explicit affected versions

Ubuntu:18.04:LTS linux-azure

20 explicit affected versions

Ubuntu:18.04:LTS linux-gcp

17 explicit affected versions

Ubuntu:18.04:LTS linux-gcp-edge

2 explicit affected versions

Ubuntu:18.04:LTS linux-hwe

1 explicit affected versions

Ubuntu:18.04:LTS linux-kvm

18 explicit affected versions

Ubuntu:18.04:LTS linux-oem

15 explicit affected versions

Ubuntu:18.04:LTS linux-raspi2

20 explicit affected versions

Ubuntu:18.04:LTS linux-snapdragon

4 explicit affected versions

Ubuntu:20.04:LTS linux-azure-fde

26 explicit affected versions

Ubuntu:20.04:LTS linux-gke

51 explicit affected versions

Ubuntu:20.04:LTS linux-raspi2

6 explicit affected versions

Ubuntu:20.04:LTS linux-riscv

12 explicit affected versions

Ubuntu:22.04:LTS linux-intel-iot-realtime

1 explicit affected versions

Ubuntu:22.04:LTS linux-realtime

1 explicit affected versions

Ubuntu:22.04:LTS linux-riscv

23 explicit affected versions

Ubuntu:24.04:LTS linux-raspi-realtime

1 explicit affected versions

Ubuntu:Pro:14.04:LTS linux

191 explicit affected versions

Ubuntu:Pro:14.04:LTS linux-aws

34 explicit affected versions

Ubuntu:Pro:14.04:LTS linux-lts-xenial

75 explicit affected versions

Ubuntu:Pro:FIPS:16.04:LTS linux-fips

8 explicit affected versions

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities UBUNTU-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_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.

View original source

05 / REFERENCES

Further evidence