cve/2024/CVE-2024-26840.md

### [CVE-2024-26840](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26840)
![](https://img.shields.io/static/v1?label=Product&message=Linux&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=2.6.30%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=9ae326a69004dea8af2dae4fde58de27db700a8d%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=blue)

### 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):    [<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() 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.