# NFSv4: Fix incorrect argument passed to nfs4_delete_lease() in nfs4_add_lease()

CVE record · `CVE-2026-90148`

- **Identifiers:** `CVE-2026-90148`
- **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, 16:06 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: `e93a5e9306a576011f03011b492d4fbaa274477b to before c951b876cccd8a4e21fe8b9712894f6a2513ddbc` (git)
  - affected: `e93a5e9306a576011f03011b492d4fbaa274477b to before e25e5b4a764638ec9e2dc6c9affe080c922ea1f2` (git)
  - affected: `e93a5e9306a576011f03011b492d4fbaa274477b to before ff7244faa13b23e9acfad9df0438f0b44b338f62` (git)
  - affected: `e93a5e9306a576011f03011b492d4fbaa274477b to before d148a652d52fd6aee96daf798922eb800ebb3018` (git)
  - affected: `e93a5e9306a576011f03011b492d4fbaa274477b to before d179ff22cd8514f966966fd9ad425dcbb98e1ada` (git)
  - affected: `e93a5e9306a576011f03011b492d4fbaa274477b to before 468e458ffde907ba19acd2102ca1fbb8f6fbede2` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.14`
  - unaffected: `before 5.14` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 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

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel NFSv4 client code is affected from commit e93a5e9306a576011f03011b492d4fbaa274477b until the fixes listed for each stable branch, and is affected in version 5.14 but not in versions before 5.14. The bug is a race between nfs4_add_lease() and a delegation return, where an incorrect argument can cause a NULL pointer dereference in generic_setlease(), which can crash the kernel. The source gives few details on who can trigger the race or what conditions are needed. Upgrade to a fixed kernel version for your branch; no workaround is listed.

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:** 0.0021, 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-2026-90148](https://www.cve.org/CVERecord?id=CVE-2026-90148)
- [NVD: CVE-2026-90148](https://nvd.nist.gov/vuln/detail/CVE-2026-90148)

### References from the CNA

- <https://git.kernel.org/stable/c/c951b876cccd8a4e21fe8b9712894f6a2513ddbc>
- <https://git.kernel.org/stable/c/e25e5b4a764638ec9e2dc6c9affe080c922ea1f2>
- <https://git.kernel.org/stable/c/ff7244faa13b23e9acfad9df0438f0b44b338f62>
- <https://git.kernel.org/stable/c/d148a652d52fd6aee96daf798922eb800ebb3018>
- <https://git.kernel.org/stable/c/d179ff22cd8514f966966fd9ad425dcbb98e1ada>
- <https://git.kernel.org/stable/c/468e458ffde907ba19acd2102ca1fbb8f6fbede2>

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-2026-90148>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90148/>. Everything for agents: <https://agentprime.io/llms.txt>.