# smb: client: fix ALIGN() overflow in symlink_data() error context loop

CVE record · `CVE-2026-89634`

- **Identifiers:** `CVE-2026-89634`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 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 9.1: 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: `76894f3e2f71177747b8b4763fb180e800279585 to before 2b4a25baa0b936fef6915c0459925077b324ecaf` (git)
  - affected: `76894f3e2f71177747b8b4763fb180e800279585 to before b89d678f9eafcf8d74885983166ba26b40a04ea0` (git)
  - affected: `76894f3e2f71177747b8b4763fb180e800279585 to before 657372ba6ea50b4474d2a6a610097eae8cd1f3e9` (git)
  - affected: `76894f3e2f71177747b8b4763fb180e800279585 to before 1f824f61d1df52392eaf0b74dfa5659d724fde30` (git)
  - affected: `76894f3e2f71177747b8b4763fb180e800279585 to before 62a3025983c8c735a3c6fc85a59316f31b59af07` (git)
  - affected: `76894f3e2f71177747b8b4763fb180e800279585 to before 62656b024efc21c3230eade1a847f25871c3d2bb` (git)
  - affected: `2d046892a493d9760c35fdaefc3017f27f91b621` (git)
  - affected: `6.0.16 to before 6.1` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.1`
  - unaffected: `before 6.1` (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

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0069, 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-2026-89634](https://www.cve.org/CVERecord?id=CVE-2026-89634)
- [NVD: CVE-2026-89634](https://nvd.nist.gov/vuln/detail/CVE-2026-89634)

### References from the CNA

- <https://git.kernel.org/stable/c/2b4a25baa0b936fef6915c0459925077b324ecaf>
- <https://git.kernel.org/stable/c/b89d678f9eafcf8d74885983166ba26b40a04ea0>
- <https://git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9>
- <https://git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30>
- <https://git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07>
- <https://git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb>

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-2026-89634>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89634/>. Everything for agents: <https://agentprime.io/llms.txt>.