# crypto: virtio - bound the akcipher result length

CVE record · `CVE-2026-80836`

- **Identifiers:** `CVE-2026-80836`
- **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:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 15:54 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: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before e0ffee8adc71a0bc548e5ebc6e021c013a874d79` (git)
  - affected: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before bd33cb19bcb432a4dd5e8f50be5e2547af1e9f78` (git)
  - affected: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before 12c4f29e97f31b013f77ad65ba7daeb02aaa6abe` (git)
  - affected: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before 5545de5050cbc3594506d74f2c392b0716cf8bca` (git)
  - affected: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before 3fda114a42f1510a4ec8a0b17a0cfc997952ccc2` (git)
  - affected: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before 1f9f877b1ef1fbd4ee95571cddf39c8002cee252` (git)
  - affected: `a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a to before f77a956f6a19f9463ef1527c9d0cda50dded6b92` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.19`
  - unaffected: `before 5.19` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.49 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.13 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2.3 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.

> The Linux kernel's virtio crypto driver is affected from version 5.19 until fixed. A virtio backend that reports a response length larger than the requested destination can cause an out-of-bounds read of adjacent kernel heap memory. Upgrade to 6.1.191, 6.6.158, 6.12.111, 6.18.49, or a later release in those series.

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:** 0.0017, the 6th 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-2026-80836](https://www.cve.org/CVERecord?id=CVE-2026-80836)
- [NVD: CVE-2026-80836](https://nvd.nist.gov/vuln/detail/CVE-2026-80836)

### References from the CNA

- <https://git.kernel.org/stable/c/e0ffee8adc71a0bc548e5ebc6e021c013a874d79>
- <https://git.kernel.org/stable/c/bd33cb19bcb432a4dd5e8f50be5e2547af1e9f78>
- <https://git.kernel.org/stable/c/12c4f29e97f31b013f77ad65ba7daeb02aaa6abe>
- <https://git.kernel.org/stable/c/5545de5050cbc3594506d74f2c392b0716cf8bca>
- <https://git.kernel.org/stable/c/3fda114a42f1510a4ec8a0b17a0cfc997952ccc2>
- <https://git.kernel.org/stable/c/1f9f877b1ef1fbd4ee95571cddf39c8002cee252>
- <https://git.kernel.org/stable/c/f77a956f6a19f9463ef1527c9d0cda50dded6b92>

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-2026-80836>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80836/>. Everything for agents: <https://agentprime.io/llms.txt>.