# RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp

CVE record · `CVE-2026-80864`

- **Identifiers:** `CVE-2026-80864`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 4 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 15:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before 87e40635d77aa19088550698c81eb295d5131f71` (git)
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before 82257379061c0a7aba6c77081d988339982af115` (git)
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before 0136b528b753c5a56e4d997ef20b86bb6750b8fb` (git)
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before ffa4f0be69656be1755090f02db38d49816585c6` (git)
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844` (git)
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before 60dfd47929cd1e7070daa810d40ce538d888410d` (git)
  - affected: `8700e3e7c4857d28ebaa824509934556da0b3e76 to before 6f7014237405e7f032b5c53a82d9eccf6161c291` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.8`
  - unaffected: `before 4.8` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.108 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.49 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.13 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2.3 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0020, the 9th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 4 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80864](https://www.cve.org/CVERecord?id=CVE-2026-80864)
- [NVD: CVE-2026-80864](https://nvd.nist.gov/vuln/detail/CVE-2026-80864)

### References from the CNA

- <https://git.kernel.org/stable/c/87e40635d77aa19088550698c81eb295d5131f71>
- <https://git.kernel.org/stable/c/82257379061c0a7aba6c77081d988339982af115>
- <https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb>
- <https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6>
- <https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844>
- <https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d>
- <https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-80864>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80864/>. Everything for agents: <https://agentprime.io/llms.txt>.