CVE-2018-20976

Se detectó un problema en el archivo fs/xfs/xfs_super.c en el kernel de Linux versiones anteriores a 4.18. Se presenta un uso de la memoria previamente liberada, relacionado a un fallo de la función xfs_fs_fs_fill_super.

A flaw was found in the Linux kernel's implementation of the XFS filesystem. A key data structure (sb->s_fs_info) may not be de-allocated when the system is under memory pressure. This same data structure is then used at a later time during filesystem operations. This could allow a local attacker who is able to groom memory to place an attacker-controlled data structure in this location and create a use-after-free situation which can result in memory corruption or privilege escalation.