# serial: core: clear freed pointers on uart_register_driver() failure

CVE record · `CVE-2026-90336`

- **Identifiers:** `CVE-2026-90336`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:08 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: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5e260edd28eddc3b92c9f578df3026fd11c710cf` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a9c0ffe5930c97b352f32febfc59a6e6ae6772ee` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 802e2192a9d38027730c2869c67c9131b8c8fe9f` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ddf51d74ee9f9857c99477329d80408cedebda61` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 06b376432974fe5f25f2843a8e8438c6a1cf3d50` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 61a2fb25551be0375bc16ef2a70c987dfca26183` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (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: `7.2.6 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 serial core function uart_register_driver() can leave pointers to freed memory after a failed registration. Drivers that check that state may then reuse the freed memory on a later probe. The source gives few details on how it is triggered. Upgrade to 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 11th percentile, on 13 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90336](https://www.cve.org/CVERecord?id=CVE-2026-90336)
- [NVD: CVE-2026-90336](https://nvd.nist.gov/vuln/detail/CVE-2026-90336)

### References from the CNA

- <https://git.kernel.org/stable/c/5e260edd28eddc3b92c9f578df3026fd11c710cf>
- <https://git.kernel.org/stable/c/a9c0ffe5930c97b352f32febfc59a6e6ae6772ee>
- <https://git.kernel.org/stable/c/802e2192a9d38027730c2869c67c9131b8c8fe9f>
- <https://git.kernel.org/stable/c/ddf51d74ee9f9857c99477329d80408cedebda61>
- <https://git.kernel.org/stable/c/06b376432974fe5f25f2843a8e8438c6a1cf3d50>
- <https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183>

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-2026-90336>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90336/>. Everything for agents: <https://agentprime.io/llms.txt>.