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CVE-2024-26840

Description

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): [] kmem_cache_alloc+0x2d5/0x370 [] prepare_creds+0x26/0x2e0 [] cachefiles_determine_cache_security+0x1f/0x120 [] cachefiles_add_cache+0x13c/0x3a0 [] cachefiles_daemon_write+0x146/0x1c0 [] vfs_write+0xcb/0x520 [] ksys_write+0x69/0xf0 [] do_syscall_64+0x72/0x140 [] entry_SYSCALL_64_after_hwframe+0x6e/0x76==================================================================Put the reference count of cache_cred in cachefiles_daemon_unbind() tofix the problem. And also put cache_cred in cachefiles_add_cache() errorbranch to avoid memory leaks.

POC

Reference

- https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8

Github

No PoCs found on GitHub currently.