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LIN1024-5982 : Security Advisory - linux - CVE-2024-56549

Created: Dec 27, 2024    Updated: Mar 7, 2025
Resolved Date: Mar 7, 2025
Found In Version: 10.24.33.1
Severity: Standard
Applicable for: Wind River Linux LTS 24
Component/s: Kernel

Description

In the Linux kernel, the following vulnerability has been resolved:

cachefiles: Fix NULL pointer dereference in object->file

At present, the object->file has the NULL pointer dereference problem in
ondemand-mode. The root cause is that the allocated fd and object->file
lifetime are inconsistent, and the user-space invocation to anon_fd uses
object->file. Following is the process that triggers the issue:

	  write fd]				[umount]
cachefiles_ondemand_fd_write_iter
				       fscache_cookie_state_machine
					 cachefiles_withdraw_cookie
  if (!file) return -ENOBUFS
					   cachefiles_clean_up_object
					     cachefiles_unmark_inode_in_use
					     fput(object->file)
					     object->file = NULL
  // file NULL pointer dereference!
  __cachefiles_write(..., file, ...)

Fix this issue by add an additional reference count to the object->file
before write/llseek, and decrement after it finished.

CREATE(Triage):(User=admin) [CVE-2024-56549 (https://nvd.nist.gov/vuln/detail/CVE-2024-56549)

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