CVE-2024-47733

/// Technical 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:

<TASK>

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()

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References