# tty: skip cdev_del() when no cdev is registered

CVE record · `CVE-2026-90335`

- **Identifiers:** `CVE-2026-90335`
- **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: `a3a10ce3429e5dee623ad5c8407ea58e204fcb0a to before 6c92b8d9c23a92f85b20bee3578d0f19cd1b1a68` (git)
  - affected: `a3a10ce3429e5dee623ad5c8407ea58e204fcb0a to before ea3d2fae7c1d6492145976553817d22e8ef69a0e` (git)
  - affected: `a3a10ce3429e5dee623ad5c8407ea58e204fcb0a to before 21031bd0d662549412378110c989b164feb6e4be` (git)
  - affected: `a3a10ce3429e5dee623ad5c8407ea58e204fcb0a to before 2af4c46b429907edc8cb069c78fca1d950120b98` (git)
  - affected: `a3a10ce3429e5dee623ad5c8407ea58e204fcb0a to before 3dbf85ef40b6366ba15e882f7536cdc98bea579a` (git)
  - affected: `a3a10ce3429e5dee623ad5c8407ea58e204fcb0a to before c3b5623fd97648f2747444aa8932ae604662df93` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.3`
  - unaffected: `before 4.3` (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.

> Linux kernel versions from 4.3 until the fix are affected. When TTY device registration fails before a cdev is allocated, later removal of the port causes a NULL-pointer dereference in cdev_del(). The source gives few details on what triggers this or who can trigger it. 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-2026-90335](https://www.cve.org/CVERecord?id=CVE-2026-90335)
- [NVD: CVE-2026-90335](https://nvd.nist.gov/vuln/detail/CVE-2026-90335)

### References from the CNA

- <https://git.kernel.org/stable/c/6c92b8d9c23a92f85b20bee3578d0f19cd1b1a68>
- <https://git.kernel.org/stable/c/ea3d2fae7c1d6492145976553817d22e8ef69a0e>
- <https://git.kernel.org/stable/c/21031bd0d662549412378110c989b164feb6e4be>
- <https://git.kernel.org/stable/c/2af4c46b429907edc8cb069c78fca1d950120b98>
- <https://git.kernel.org/stable/c/3dbf85ef40b6366ba15e882f7536cdc98bea579a>
- <https://git.kernel.org/stable/c/c3b5623fd97648f2747444aa8932ae604662df93>

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-2026-90335>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90335/>. Everything for agents: <https://agentprime.io/llms.txt>.