# CVE-2026-80988

## Summary

- **CVE ID:** CVE-2026-80988
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

NTB: ntb_transport: Fail TX enqueue when the QP link is down

Commit f195a1a6fe41 ("ntb: Drop packets when qp link is down") meant to
make ntb_transport_tx_enqueue() drop packets submitted while the QP link
is down, but it only returns 0 without consuming the packet. Zero means
success by this function's contract, so ntb_netdev reports NETDEV_TX_OK
and forgets the skb: nothing queued it, nothing frees it, and it leaks,
one skb for every transmit racing a link-down.

Return -ENOLINK instead, restoring the contract that a non-zero return
leaves the buffer owned by the caller. With the preceding patch,
ntb_netdev frees the skb on non-retryable enqueue failures and returns
NETDEV_TX_OK, so a packet racing with link-down is dropped without leaking
or entering a busy retry loop.

## Affected Products

- Linux — Linux (f195a1a6fe416882984f8bd6c61afc1383171860)
- Linux — Linux (aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9)
- Linux — Linux (a8986a61ebee0b54c5d648444fbae09bd1c6dcd2)
- Linux — Linux (94491412a2afc8a5aea4c5b455aed86d3486f0b1)
- Linux — Linux (3cfdc448e8bfa8a7eaa5af87f357330566124b78)
- Linux — Linux (bfa051f650a7708183bd86901ca4645dcf88c486)
- Linux — Linux (4f4af6b8b7a23fa37decaf43b55403e6bfd8e219)
- Linux — Linux (c2cd5d993f57f819d46fe62387d3cc34d8468e60)
- Linux — Linux (449b1978d4e50b14b2a4de3a26d0b074593926a3)
- Linux — Linux (4.14.326)
- Linux — Linux (4.19.295)
- Linux — Linux (5.4.257)
- Linux — Linux (5.10.195)
- Linux — Linux (5.15.132)
- Linux — Linux (6.1.53)
- Linux — Linux (6.4.16)
- Linux — Linux (6.5.3)
- Linux — Linux (6.6)
- 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/5eca0d899a3be661a7e2caaaa7467a6fa15d756c)
- [CNA](https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167)
- [CNA](https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2)
- [CNA](https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba)
- [CNA](https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06)
- [CNA](https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07)
- [CNA](https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361)
- [CNA](https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._