# NFSv4: remove callback IDR entry on client allocation failure

CVE record · `CVE-2026-90151`

- **Identifiers:** `CVE-2026-90151`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **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, 16:06 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before 68c721391b761dbe38d5b0094d2bb6e8489ad92b` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before 9bfdd0f591307b5198826a0e7a5b2f35f87acd2d` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before 7c4812eb96bdcafb31a65b12f2aa96659429d1d4` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before fc95ca82d5ae598c428ab5a00ae69f8526d59371` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before 80b1c3d5a881f7d9081aa9f46da9742878a0f893` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before 3f2387e8bfbc4efda5d77c3a11a028d0a119c48f` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before 5891c03e150920618db0e9c4ea2d772abacdcfd1` (git)
  - affected: `f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to before d05c2007b3d84ccba11dc6e9cb3202768cc72f14` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.38`
  - unaffected: `before 2.6.38` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (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

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0075, the 55th 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-2026-90151](https://www.cve.org/CVERecord?id=CVE-2026-90151)
- [NVD: CVE-2026-90151](https://nvd.nist.gov/vuln/detail/CVE-2026-90151)

### References from the CNA

- <https://git.kernel.org/stable/c/68c721391b761dbe38d5b0094d2bb6e8489ad92b>
- <https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d>
- <https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4>
- <https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371>
- <https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893>
- <https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f>
- <https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1>
- <https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14>

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-2026-90151>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90151/>. Everything for agents: <https://agentprime.io/llms.txt>.