# ntb: Store original DMA address for future release

CVE record · `CVE-2026-80884`

- **Identifiers:** `CVE-2026-80884`
- **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, 16:49 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: `fc5d1829f9bf3d8275322727c0e9a8baf268b7c6 to before 05a4585f76fd7bbec41bb7bf07a4d2ee2ba607d0` (git)
  - affected: `fc5d1829f9bf3d8275322727c0e9a8baf268b7c6 to before 2b9ddb7311c79e8af2410abd97765fffd9ddf586` (git)
  - affected: `fc5d1829f9bf3d8275322727c0e9a8baf268b7c6 to before a4a046f668c7c7d0df9510cc426678563fff1b03` (git)
  - affected: `fc5d1829f9bf3d8275322727c0e9a8baf268b7c6 to before 0f035333e19944f8ea7a423681f161eb1b2db21c` (git)
  - affected: `fc5d1829f9bf3d8275322727c0e9a8baf268b7c6 to before 10662aafce4acd52278c942d0a5b3993594017b9` (git)
  - affected: `fc5d1829f9bf3d8275322727c0e9a8baf268b7c6 to before da6d997ac556479c112554ab5d95cbd04683eb11` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.20`
  - unaffected: `before 4.20` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.5 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel ntb driver is affected from 4.20 until fixed, because it modifies the DMA address it stored and later passes a handle that differs from the one the allocation returned. The source gives few details on what an attacker could do with this. Upgrade to a fixed kernel, such as 6.1.191, 6.6.160, 6.12.114, 6.18.57 or a later release in those series.

Written 12 Nov 2026.

## 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:** 0.0022, the 12th 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-2026-80884](https://www.cve.org/CVERecord?id=CVE-2026-80884)
- [NVD: CVE-2026-80884](https://nvd.nist.gov/vuln/detail/CVE-2026-80884)

### References from the CNA

- <https://git.kernel.org/stable/c/05a4585f76fd7bbec41bb7bf07a4d2ee2ba607d0>
- <https://git.kernel.org/stable/c/2b9ddb7311c79e8af2410abd97765fffd9ddf586>
- <https://git.kernel.org/stable/c/a4a046f668c7c7d0df9510cc426678563fff1b03>
- <https://git.kernel.org/stable/c/0f035333e19944f8ea7a423681f161eb1b2db21c>
- <https://git.kernel.org/stable/c/10662aafce4acd52278c942d0a5b3993594017b9>
- <https://git.kernel.org/stable/c/da6d997ac556479c112554ab5d95cbd04683eb11>

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-2026-80884>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80884/>. Everything for agents: <https://agentprime.io/llms.txt>.