CVE-2024-53138 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net/mlx5e: kTLS Fix incorrect page refcounting

The kTLS tx handling code is using a mix of get_page() and page_ref_inc() APIs to increment the page reference. But on the release path (mlx5e_ktls_tx_handle_resync_dump_comp()) only put_page() is used.

This is an issue when using pages from large folios: the get_page() references are stored on the folio page while the page_ref_inc() references are stored directly in the given page. On release the folio page will be dereferenced too many times.

This was found while doing kTLS testing with sendfile() + ZC when the served file was read from NFS on a kernel with NFS large folios support (commit 49b29a573da8 ( fs: add support for large folios)).

Reference

https://git.kernel.org/stable/c/2723e8b2cbd486cb96e5a61b22473f7fd62e18df https://git.kernel.org/stable/c/69fbd07f17b0fdaf8970bc705f5bf115c297839d https://git.kernel.org/stable/c/93a14620b97c911489a5b008782f3d9b0c4aeff4 https://git.kernel.org/stable/c/dd6e972cc5890d91d6749bb48e3912721c4e4b25