# serial: core: do fallible allocations before the console can be registered

CVE record · `CVE-2026-90337`

- **Identifiers:** `CVE-2026-90337`
- **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: `266dcff03eed0050b6af11aaf2a61ab837d7ba3f to before be61f56c4f0ed1cbf16c5f7b0dec6d6414993dd4` (git)
  - affected: `266dcff03eed0050b6af11aaf2a61ab837d7ba3f to before e2ddbfd826836cba1b7a25ee4eb512f7d752b703` (git)
  - affected: `266dcff03eed0050b6af11aaf2a61ab837d7ba3f to before 8c7c75bfa7b84d6999de2100ce9c09e3779249a0` (git)
  - affected: `266dcff03eed0050b6af11aaf2a61ab837d7ba3f to before 9260a92ce90e6a95ce2ffdf1441c5216bf3f9552` (git)
  - affected: `266dcff03eed0050b6af11aaf2a61ab837d7ba3f to before c2aec15f78b2e6ccd9b94216a901248511355982` (git)
  - affected: `266dcff03eed0050b6af11aaf2a61ab837d7ba3f to before 1a0e4fbce5d9c1bc179a35a2fd9ed142664299e3` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.17`
  - unaffected: `before 3.17` (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 can leave a console registered after a memory allocation failure while a serial port is being added, which can lead to a NULL pointer dereference or a use-after-free in console output. The source gives few details on what an attacker needs to trigger it. Upgrade to Linux kernel 6.1.191, 6.6.160, 6.12.114, 6.18.57, or a later fixed release.

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-2026-90337](https://www.cve.org/CVERecord?id=CVE-2026-90337)
- [NVD: CVE-2026-90337](https://nvd.nist.gov/vuln/detail/CVE-2026-90337)

### References from the CNA

- <https://git.kernel.org/stable/c/be61f56c4f0ed1cbf16c5f7b0dec6d6414993dd4>
- <https://git.kernel.org/stable/c/e2ddbfd826836cba1b7a25ee4eb512f7d752b703>
- <https://git.kernel.org/stable/c/8c7c75bfa7b84d6999de2100ce9c09e3779249a0>
- <https://git.kernel.org/stable/c/9260a92ce90e6a95ce2ffdf1441c5216bf3f9552>
- <https://git.kernel.org/stable/c/c2aec15f78b2e6ccd9b94216a901248511355982>
- <https://git.kernel.org/stable/c/1a0e4fbce5d9c1bc179a35a2fd9ed142664299e3>

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-2026-90337>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90337/>. Everything for agents: <https://agentprime.io/llms.txt>.