# nfc: st21nfca: validate ATR_REQ length against the received frame

CVE record · `CVE-2026-80823`

- **Identifiers:** `CVE-2026-80823`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 4 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 15:27 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: `1892bf844ea0261736bd5e75546fc996e9daeedf to before 785df00bb3ae3206674a43284eb06dac575b5c64` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before 2c1ad291f4cdc357f9527b688c6fda9c6ffa7890` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before 9635507fe82949e429b3cd938876a9917125b151` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before 0f344944c506b4f02d2b098489f7268b438c369e` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before 304f5b414f4051d324b8c4a3ab0e79f7dc7e150e` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before f33cecf69095c43be88567fef92b180b858f7369` (git)
  - affected: `1892bf844ea0261736bd5e75546fc996e9daeedf to before 5cdcca5d62a66eda6b774110a44cba67bc1a8d1d` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.17`
  - unaffected: `before 3.17` (semver)
  - unaffected: `5.10.267 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.218 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.185 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.154 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.106 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.47 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.11 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2.1 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:** 0.0019, the 9th percentile, on 14 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 4 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80823](https://www.cve.org/CVERecord?id=CVE-2026-80823)
- [NVD: CVE-2026-80823](https://nvd.nist.gov/vuln/detail/CVE-2026-80823)

### References from the CNA

- <https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64>
- <https://git.kernel.org/stable/c/2c1ad291f4cdc357f9527b688c6fda9c6ffa7890>
- <https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa>
- <https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151>
- <https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e>
- <https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d>
- <https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e>
- <https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369>
- <https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d>

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-2026-80823>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80823/>. Everything for agents: <https://agentprime.io/llms.txt>.