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vulnerability bulletin CVE-2018-20836

Linux kernel: use after free via smp_task_timedout

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via smp_task_timedout() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted products: Debian, Linux, openSUSE Leap, RSA Authentication Manager, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this bulletin: 2/4.
Consequences of an intrusion: administrator access/rights, denial of service on server.
Hacker's origin: user shell.
Creation date: 12/07/2019.
Références of this threat: CERTFR-2019-AVI-330, CERTFR-2019-AVI-337, CERTFR-2019-AVI-346, CERTFR-2019-AVI-354, CERTFR-2019-AVI-381, CERTFR-2019-AVI-392, CVE-2018-20836, DLA-1884-1, DLA-1885-1, DSA-2019-133, DSA-4495-1, DSA-4497-1, openSUSE-SU-2019:1716-1, openSUSE-SU-2019:1757-1, SUSE-SU-2019:14127-1, SUSE-SU-2019:1823-1, SUSE-SU-2019:1823-2, SUSE-SU-2019:1851-1, SUSE-SU-2019:1852-1, SUSE-SU-2019:1854-1, SUSE-SU-2019:1855-1, SUSE-SU-2019:1870-1, USN-4076-1, VIGILANCE-VUL-29763.

Description of the vulnerability

An attacker can force the usage of a freed memory area via smp_task_timedout() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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