# CVE-2026-80987

## Summary

- **CVE ID:** CVE-2026-80987
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## 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 — Linux (fce8a7bb5b4bfb8a27324703fd5b002ee9247e90)
- Linux — Linux (3.9)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87)
- [CNA](https://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0)
- [CNA](https://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd)
- [CNA](https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7)
- [CNA](https://git.kernel.org/stable/c/4890152a3069f5cb58cc24b08cfd5fe95e568fa1)
- [CNA](https://git.kernel.org/stable/c/668aa3238548584ca9772da9cf43ae8c2389bbf1)
- [CNA](https://git.kernel.org/stable/c/9b0fa8a9e1057614a533cc3f18b17f82aab028d8)
- [CNA](https://git.kernel.org/stable/c/b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 42.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._