Vigil@nce - Linux kernel: use after free via ext4_expand_extra_isize
February 2020 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/computer-vulnerability
SYNTHESIS OF THE VULNERABILITY
Impacted products: Debian, Linux, SIMATIC, SUSE Linux Enterprise
Desktop, SLES, Ubuntu.
Severity: 2/4.
Consequences: administrator access/rights, denial of service on
server.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 13/12/2019.
DESCRIPTION OF THE VULNERABILITY
An attacker can force the usage of a freed memory area via
ext4_expand_extra_isize() 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-ext4-expand-extra-isize-31147