CVE-2018-20976

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.

Red Hat Enterprise Linux 7.6.z had fixed this flaw mid release without it being recognised as a CVE. Prior releases of Red Hat Enterprise Linux EUS/AUS will still require the fix to be secure. Trackers have been made and fixes will be available as part of the standard release cycle.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.