# iommu/msm: Unwind probe state on registration failure

CVE record · `CVE-2026-89452`

- **Identifiers:** `CVE-2026-89452`
- **State:** Confirmed
- **Severity:** CVSS 8.4 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: `42df43b36163ed7d0ab13992e411093252903273 to before 51424c14dbdadc8c2ad4abf842265a50f69d78aa` (git)
  - affected: `42df43b36163ed7d0ab13992e411093252903273 to before 6a1ae472113762f794682229a0f233f1ee0f69a4` (git)
  - affected: `42df43b36163ed7d0ab13992e411093252903273 to before 51e37f9179387b6e3fa64a3d3b4fece1a38b3a02` (git)
  - affected: `42df43b36163ed7d0ab13992e411093252903273 to before f532401be9312ecd166f616bb74a65b0b4c150fa` (git)
  - affected: `42df43b36163ed7d0ab13992e411093252903273 to before 7f7074a886c4a93e3d12076ce60a510a1ebe400c` (git)
  - affected: `42df43b36163ed7d0ab13992e411093252903273 to before 535a200220ca2c83bc8bf54bd2cbe045d6ee70c4` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.11`
  - unaffected: `before 4.11` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.112 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 iommu/msm driver, from version 4.11 until fixed, can leave a dangling list entry when probe fails during registration, which later list walks may dereference. The source gives few details on how an attacker would reach this. Upgrade to 6.1.191, 6.6.160, 6.12.112, 6.18.50, 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0019, the 8th 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-2026-89452](https://www.cve.org/CVERecord?id=CVE-2026-89452)
- [NVD: CVE-2026-89452](https://nvd.nist.gov/vuln/detail/CVE-2026-89452)

### References from the CNA

- <https://git.kernel.org/stable/c/51424c14dbdadc8c2ad4abf842265a50f69d78aa>
- <https://git.kernel.org/stable/c/6a1ae472113762f794682229a0f233f1ee0f69a4>
- <https://git.kernel.org/stable/c/51e37f9179387b6e3fa64a3d3b4fece1a38b3a02>
- <https://git.kernel.org/stable/c/f532401be9312ecd166f616bb74a65b0b4c150fa>
- <https://git.kernel.org/stable/c/7f7074a886c4a93e3d12076ce60a510a1ebe400c>
- <https://git.kernel.org/stable/c/535a200220ca2c83bc8bf54bd2cbe045d6ee70c4>

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-2026-89452>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89452/>. Everything for agents: <https://agentprime.io/llms.txt>.