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Vulnerability of Linux kernel: use after free via cpia2_exit

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via cpia2_exit() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Debian, Linux, SUSE Linux Enterprise Desktop, SLES.
Severity of this announce: 2/4.
Creation date: 30/12/2019.
Références of this computer vulnerability: CERTFR-2020-AVI-029, CVE-2019-19966, DLA-2068-1, SUSE-SU-2020:0093-1, VIGILANCE-VUL-31243.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via cpia2_exit() of the L...
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This computer weakness alert impacts software or systems such as Debian, Linux, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this weakness note is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this weakness bulletin.

Solutions for this threat 

Workarounds for this vulnerability are not yet public.
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