# nvme-tcp: fix host memory disclosure on R2T for a read command

CVE record · `CVE-2026-89481`

- **Identifiers:** `CVE-2026-89481`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:43 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: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before effe898669c5f69ed519d6339be01ee9cd91d1a4` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before 377aa04d7b3e73ffef6364818def188da8d6f025` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before 49a4dcf57608ebf6432dbcb203ed25e7ed581445` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before bc4013c7cce58d46f792c8c87bc8c8318a70190e` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before a4c3c7310156493797c920b10d8648c07aa05403` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5` (git)
  - affected: `3f2304f8c6d6ed97849057bd16fee99e434ca796 to before 6efbc52237facda35d2d874fe1765bb4839275d8` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.0`
  - unaffected: `before 5.0` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 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 nvme-tcp driver is affected from commit 3f2304f8c6d6ed97849057bd16fee99e434ca796 up to the fixed commits listed for each stable branch, and from 5.0 in mainline. A malicious NVMe over TCP controller can send an R2T (ready-to-transfer) request for a READ command, causing the host to send the contents of its read buffer back to the controller, which can disclose host kernel memory. Upgrade to a fixed kernel release for your branch: 5.10.273 or later, 5.15.224 or later, 6.1.188 or later, or 6.6.157 or later. No workaround is listed.

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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0043, the 38th 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89481](https://www.cve.org/CVERecord?id=CVE-2026-89481)
- [NVD: CVE-2026-89481](https://nvd.nist.gov/vuln/detail/CVE-2026-89481)

### References from the CNA

- <https://git.kernel.org/stable/c/effe898669c5f69ed519d6339be01ee9cd91d1a4>
- <https://git.kernel.org/stable/c/377aa04d7b3e73ffef6364818def188da8d6f025>
- <https://git.kernel.org/stable/c/49a4dcf57608ebf6432dbcb203ed25e7ed581445>
- <https://git.kernel.org/stable/c/bc4013c7cce58d46f792c8c87bc8c8318a70190e>
- <https://git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403>
- <https://git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c>
- <https://git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5>
- <https://git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8>

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-2026-89481>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-89481/>. Everything for agents: <https://agentprime.io/llms.txt>.