Vigil@nce - Linux kernel: use after free via TIOCGSID
February 2021 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/computer-vulnerability
SYNTHESIS OF THE VULNERABILITY
Impacted products: Debian, Fedora, Linux, openSUSE Leap, SUSE
Linux Enterprise Desktop, SLES.
Severity: 2/4.
Consequences: administrator access/rights, denial of service on
server.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 10/12/2020.
DESCRIPTION OF THE VULNERABILITY
An attacker can force the usage of a freed memory area via
TIOCGSID of the Linux kernel, in order to trigger a denial of
service, and possibly to run code.
ACCESS TO THE FULL VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Linux-kernel-use-after-free-via-TIOCGSID-34081