Vulnerability CVE-2024-35962
Published: 2024-05-20

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

netfilter: complete validation of user input

In my recent commit, I missed that do_replace() handlers
use copy_from_sockptr() (which I fixed), followed
by unsafe copy_from_sockptr_offset() calls.

In all functions, we can perform the @optlen validation
before even calling xt_alloc_table_info() with the following
check:

if ((u64)optlen < (u64)tmp.size + sizeof(tmp))
return -EINVAL;

 References:
https://git.kernel.org/stable/c/cf4bc359b76144a3dd55d7c09464ef4c5f2b2b05
https://git.kernel.org/stable/c/97dab36e57c64106e1c8ebd66cbf0d2d1e52d6b7
https://git.kernel.org/stable/c/c760089aa98289b4b88a7ff5a62dd92845adf223
https://git.kernel.org/stable/c/89242d9584c342cb83311b598d9e6b82572eadf8
https://git.kernel.org/stable/c/562b7245131f6e9f1d280c8b5a8750f03edfc05c
https://git.kernel.org/stable/c/65acf6e0501ac8880a4f73980d01b5d27648b956
Copyright 2026, cxsecurity.com

 

Back to Top