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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


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