NTB: ntb_transport: Reject oversized TX buffers

Summary

In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Reject oversized TX buffers ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it. Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and return -EMSGSIZE. The caller retains ownership of the buffer, and the preceding netdev patch frees the skb when enqueue returns this permanent error.

Timeline

1. Sep 11, 2026, 7:42 PM UTCCVE published
2. Oct 16, 2026, 7:21 PM UTCCISA SSVC assessment

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

3. Oct 19, 2026, 8:46 AM UTCRecord last updated

Affected versions

• Linux Linux

  From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in 4890152a3069f5cb58cc24b08cfd5fe95e568fa1; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in 668aa3238548584ca9772da9cf43ae8c2389bbf1; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in 9b0fa8a9e1057614a533cc3f18b17f82aab028d8; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in a7f22105a7df8c7fd74d0af27ace6fa94fe03d87; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in 75a604e9f1cfdebda421062fdf42225ca32154cd; From fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 · fixed in a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7

• Linux Linux

  3.9

• KernelLinux

  From 3.9.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8