# svcrdma: Validate Read chunk positions before reconstruction

CVE record · `CVE-2026-89526`

- **Identifiers:** `CVE-2026-89526`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **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, 19:44 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 to before 6388f2ed36c10f59d926735b92c2b152d2c635e5` (git)
  - affected: `d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 to before 3861eeabaebe243050952b34063763527c44e1fe` (git)
  - affected: `d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 to before 5ab3f6d882fe07ae5e61d0bcfeea00b9409155c2` (git)
  - affected: `d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 to before f84ec84d8d4bc65f9ae23372570349687f66fa39` (git)
  - affected: `d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 to before 577097455d084610fc31e91e6a61c5793b6f04ba` (git)
  - affected: `d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 to before 3779b7b9e7d1c8ba4738f9d327de3b0288cefe9b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.11`
  - unaffected: `before 5.11` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 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's svcrdma (RPC/RDMA server) code is affected from 5.11 until fixed. A remote client can send Read chunk positions that are not checked against the inline request body, which can expose adjacent kernel slab memory to the client. Upgrade to a fixed release, such as 6.1.191, 6.6.160, 6.12.109 or 6.18.50 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0068, the 53rd 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-2026-89526](https://www.cve.org/CVERecord?id=CVE-2026-89526)
- [NVD: CVE-2026-89526](https://nvd.nist.gov/vuln/detail/CVE-2026-89526)

### References from the CNA

- <https://git.kernel.org/stable/c/6388f2ed36c10f59d926735b92c2b152d2c635e5>
- <https://git.kernel.org/stable/c/3861eeabaebe243050952b34063763527c44e1fe>
- <https://git.kernel.org/stable/c/5ab3f6d882fe07ae5e61d0bcfeea00b9409155c2>
- <https://git.kernel.org/stable/c/f84ec84d8d4bc65f9ae23372570349687f66fa39>
- <https://git.kernel.org/stable/c/577097455d084610fc31e91e6a61c5793b6f04ba>
- <https://git.kernel.org/stable/c/3779b7b9e7d1c8ba4738f9d327de3b0288cefe9b>

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-2026-89526>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89526/>. Everything for agents: <https://agentprime.io/llms.txt>.