In the Linux kernel, the following vulnerability has been resolved:
cachefiles: fix memory leak in cachefiles_add_cache() The following memory
leak was reported after unbinding /dev/cachefiles:

unreferenced object 0xffff9b674176e3c0 (size 192): comm “cachefilesd2”, pid
680, jiffies 4294881224 hex dump (first 32 bytes): 01 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 … 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 … backtrace (crc ea38a44b):
[<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370 [<ffffffff8e917f86>]
prepare_creds+0x26/0x2e0 [<ffffffffc002eeef>]
cachefiles_determine_cache_security+0x1f/0x120 [<ffffffffc00243ec>]
cachefiles_add_cache+0x13c/0x3a0 [<ffffffffc0025216>]
cachefiles_daemon_write+0x146/0x1c0 [<ffffffff8ebc4a3b>]
vfs_write+0xcb/0x520 [<ffffffff8ebc5069>] ksys_write+0x69/0xf0
[<ffffffff8f6d4662>] do_syscall_64+0x72/0x140 [<ffffffff8f8000aa>]
entry_SYSCALL_64_after_hwframe+0x6e/0x76
================================================================== Put the
reference count of cache_cred in cachefiles_daemon_unbind() to fix the
problem. And also put cache_cred in cachefiles_add_cache() error branch to
avoid memory leaks.