# IB/isert: reject login PDUs declaring more data than was received

CVE record · `CVE-2026-90413`

- **Identifiers:** `CVE-2026-90413`
- **State:** Confirmed
- **Severity:** CVSS 9.1 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, 16:09 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 9.1: 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: `b8d26b3be8b33682cf163274ed07479a70554633 to before b1f3313e7b3e396e4985fea5c709477387e0a065` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before 228aaa620fe6a7bc8b5b21dd348b4836b1760c61` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before 0d9c0586af703890afe1bd0cfe641e3a3af1c32d` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before 44fe800ec13386c88bd5b32bcd1deaa1e17535d5` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before 71ec8bbfa4a183f1e623662f9cfbcd702e433bdb` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before c345d9d0b3eefc990bb90cf565325785aab06aab` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before 48812c8103071d550d9ab4a3431be5bdc52255bc` (git)
  - affected: `b8d26b3be8b33682cf163274ed07479a70554633 to before 2488b5b4827e5415768afc8daf097e8eb83c98df` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.10`
  - unaffected: `before 3.10` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0084, the 58th 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-2026-90413](https://www.cve.org/CVERecord?id=CVE-2026-90413)
- [NVD: CVE-2026-90413](https://nvd.nist.gov/vuln/detail/CVE-2026-90413)

### References from the CNA

- <https://git.kernel.org/stable/c/b1f3313e7b3e396e4985fea5c709477387e0a065>
- <https://git.kernel.org/stable/c/228aaa620fe6a7bc8b5b21dd348b4836b1760c61>
- <https://git.kernel.org/stable/c/0d9c0586af703890afe1bd0cfe641e3a3af1c32d>
- <https://git.kernel.org/stable/c/44fe800ec13386c88bd5b32bcd1deaa1e17535d5>
- <https://git.kernel.org/stable/c/71ec8bbfa4a183f1e623662f9cfbcd702e433bdb>
- <https://git.kernel.org/stable/c/c345d9d0b3eefc990bb90cf565325785aab06aab>
- <https://git.kernel.org/stable/c/48812c8103071d550d9ab4a3431be5bdc52255bc>
- <https://git.kernel.org/stable/c/2488b5b4827e5415768afc8daf097e8eb83c98df>

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-2026-90413>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90413/>. Everything for agents: <https://agentprime.io/llms.txt>.