kernel: cachefiles: fix dentry leak in cachefiles_open_file()

A flaw was found in the Linux kernel's cachefiles component. A local attacker could exploit a dentry directory entry leak caused by a concurrency issue between a lookup cookie and a cull operation. This flaw prevents the proper release of a reference count, which can lead to resource exhaustion a...

CVE-2024-49870

In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix dentry leak in cachefilesopenfile A dentry leak may be caused when a lookup cookie and a cull are concurrent: P1 | P2 ----------------------------------------------------------- cachefileslookupcookie...