net/mlx5e: kTLS, Fix incorrect page refcounting

Summary

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 ("nfs: add support for large folios")).

Timeline

1. Dec 4, 2024, 2:20 PM UTCCVE published
2. Oct 15, 2026, 9:40 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: total

3. Oct 15, 2026, 9:41 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in a0ddb20a748b122ea86003485f7992fa5e84cc95; From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in ffad2ac8c859c1c1a981fe9c4f7ff925db684a43; From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in c7b97f9e794d8e2bbaa50e1d6c230196fd214b5e; From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in 69fbd07f17b0fdaf8970bc705f5bf115c297839d; From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in 93a14620b97c911489a5b008782f3d9b0c4aeff4; From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in 2723e8b2cbd486cb96e5a61b22473f7fd62e18df; From 84d1bb2b139e0184b1754aa1b5776186b475fce8 · fixed in dd6e972cc5890d91d6749bb48e3912721c4e4b25

• Linux Linux

  5.4

• KernelLinux

  From 5.4.0 · fixed in 5.4.287; From 5.5.0 · fixed in 5.10.231; From 5.11.0 · fixed in 5.15.174; From 5.16.0 · fixed in 6.1.119; From 6.2.0 · fixed in 6.6.63; From 6.7.0 · fixed in 6.11.10

References 7