# s390/debug: Fix deadlock during unregister

CVE record · `CVE-2026-90209`

- **Identifiers:** `CVE-2026-90209`
- **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:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:07 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: `9372a82892c2caa6bccab9a4081166fa769699f8 to before a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed` (git)
  - affected: `9372a82892c2caa6bccab9a4081166fa769699f8 to before 183f8f6d64bb0510070c856b9927618c53014a7b` (git)
  - affected: `9372a82892c2caa6bccab9a4081166fa769699f8 to before a08b70ed2d1ec907353a72f15163b8e34ff4b2f8` (git)
  - affected: `9372a82892c2caa6bccab9a4081166fa769699f8 to before 45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba` (git)
  - affected: `9372a82892c2caa6bccab9a4081166fa769699f8 to before 5d83f3faa3fb7f23f298cfd40382611999de5d1d` (git)
  - affected: `9372a82892c2caa6bccab9a4081166fa769699f8 to before 54e1259b75d6402a1d0cfb822b9bb2c507e53dab` (git)
  - affected: `9372a82892c2caa6bccab9a4081166fa769699f8 to before 445c31ac638fd1af203d79bdf25fc0cb3149fbbc` (git)
  - affected: `c68ba4a708fbd0efdc384cd29250bb292a45e559` (git)
  - affected: `86f9980909f31ab205323eeeb290fe3cbb4952b4` (git)
  - affected: `fe5793e90d3f572a87ba67fe2f0e1679fdff14f8` (git)
  - affected: `e234f66168f0d50c0d28154fb983a14e85c3c526` (git)
  - affected: `5.4.146 to before 5.5` (semver)
  - and 3 more
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.15`
  - unaffected: `before 5.15` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 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

## 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-2026-90209](https://www.cve.org/CVERecord?id=CVE-2026-90209)
- [NVD: CVE-2026-90209](https://nvd.nist.gov/vuln/detail/CVE-2026-90209)

### References from the CNA

- <https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed>
- <https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b>
- <https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8>
- <https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba>
- <https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d>
- <https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab>
- <https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc>

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-2026-90209>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90209/>. Everything for agents: <https://agentprime.io/llms.txt>.