CVE-2024-26840

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cachefiles: fix memory leak in cachefiles_add_cache()<br /> <br /> The following memory leak was reported after unbinding /dev/cachefiles:<br /> <br /> ==================================================================<br /> unreferenced object 0xffff9b674176e3c0 (size 192):<br /> comm "cachefilesd2", pid 680, jiffies 4294881224<br /> hex dump (first 32 bytes):<br /> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................<br /> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................<br /> backtrace (crc ea38a44b):<br /> [] kmem_cache_alloc+0x2d5/0x370<br /> [] prepare_creds+0x26/0x2e0<br /> [] cachefiles_determine_cache_security+0x1f/0x120<br /> [] cachefiles_add_cache+0x13c/0x3a0<br /> [] cachefiles_daemon_write+0x146/0x1c0<br /> [] vfs_write+0xcb/0x520<br /> [] ksys_write+0x69/0xf0<br /> [] do_syscall_64+0x72/0x140<br /> [] entry_SYSCALL_64_after_hwframe+0x6e/0x76<br /> ==================================================================<br /> <br /> Put the reference count of cache_cred in cachefiles_daemon_unbind() to<br /> fix the problem. And also put cache_cred in cachefiles_add_cache() error<br /> branch to avoid memory leaks.