Vigil@nce - Linux kernel: use after free via ext4_xattr_set_entry
January 2020 by Vigil@nce
SYNTHESIS OF THE VULNERABILITY
Impacted products: Linux, 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: 28/11/2019.
DESCRIPTION OF THE VULNERABILITY
An attacker can force the usage of a freed memory area via ext4_xattr_set_entry() 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-xattr-set-entry-31021