CVE-2024-47733 Information

Description

In the Linux kernel the following vulnerability has been resolved:

netfs: Delete subtree of ‘fs/netfs’ when netfs module exits

In netfs_init() or fscache_proc_init() we create dentry under ‘fs/netfs’ but in netfs_exit() we only delete the proc entry of ‘fs/netfs’ without deleting its subtree. This triggers the following WARNING:

================================================================== remove_proc_entry: removing non-empty directory ‘fs/netfs’ leaking at least ‘requests’ WARNING: CPU: 4 PID: 566 at fs/proc/generic.c:717 remove_proc_entry+0x160/0x1c0 Modules linked in: netfs(-) CPU: 4 UID: 0 PID: 566 Comm: rmmod Not tainted 6.11.0-rc3 860 RIP: 0010:remove_proc_entry+0x160/0x1c0 Call Trace: netfs_exit+0x12/0x620 [netfs] __do_sys_delete_module.isra.0+0x14c/0x2e0 do_syscall_64+0x4b/0x110 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Therefore use remove_proc_subtree() instead of remove_proc_entry() to fix the above problem.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

https://git.kernel.org/stable/c/603f95cefbee06a31b03137b777f03e3c2163d72 https://git.kernel.org/stable/c/7a9eaf97d56625e55b31a7beb558e1ee185ca461 https://git.kernel.org/stable/c/3c58a9575e02c2b90a3180007d57105ceaa7c246

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5