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CVE-2026-80987: NTB: ntb_transport: Reject oversized TX buffers

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: 3.9 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4890152a3069f5cb58cc24b08cfd5fe95e568fa1
• https://git.kernel.org/stable/c/668aa3238548584ca9772da9cf43ae8c2389bbf1
• https://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0
• https://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd
• https://git.kernel.org/stable/c/9b0fa8a9e1057614a533cc3f18b17f82aab028d8
• https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7
• https://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87
• https://git.kernel.org/stable/c/b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88

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