# CVE-2026-74378

## Summary

- **CVE ID:** CVE-2026-74378
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Aug 15, 2026
- **Last Modified:** Sep 14, 2026

## Description

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

RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe

get_srq_wqe() reads wqe->dma.num_sge from the shared receive queue
buffer, which is mapped into userspace. It validates num_sge against
max_sge, but then re-reads the same field to calculate the memcpy
size. A concurrent userspace thread can modify num_sge between
validation and use, causing a heap buffer overflow when copying the
WQE into qp->resp.srq_wqe.

Read num_sge into a local variable and use it for both the bounds
check and the size calculation.

## Affected Products

- Linux — Linux (8700e3e7c4857d28ebaa824509934556da0b3e76)
- Linux — Linux (4.8)
- Linux — Linux (0)
- Linux — Linux (6.1.178)
- Linux — Linux (6.6.145)
- Linux — Linux (6.12.97)
- Linux — Linux (6.18.40)
- Linux — Linux (7.1.5)
- Linux — Linux (7.2-rc1)
- Linux — Linux (7.2)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)

## References

- [CNA](https://git.kernel.org/stable/c/3cfa2a3adc51b7c57729961a03446962ff10e3d2)
- [CNA](https://git.kernel.org/stable/c/cd19a6345e3727adafafa5954b58b13c92e13b80)
- [CNA](https://git.kernel.org/stable/c/3e07ea9579dc9553d2285c26c2823931358aa3b8)
- [CNA](https://git.kernel.org/stable/c/02558c86b6b761063e9399e6b939984500327ef1)
- [CNA](https://git.kernel.org/stable/c/b9800d7953d119bcc068c74587d48e4ba0313629)
- [CNA](https://git.kernel.org/stable/c/22b8fbded65b8c441b634a185f8da67657df6c50)
- [CNA](https://git.kernel.org/stable/c/c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe)
- [CNA](https://git.kernel.org/stable/c/e48daa94ad2d406225b73491fc935064716f0ec7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.9

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