# tls: device: fix out-of-bounds write in tls_append_frag()

CVE record · `CVE-2026-80852`

- **Identifiers:** `CVE-2026-80852`
- **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, 15:55 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: `e8f69799810c32dd40c6724d829eccc70baad07f to before bc09411a11b5a676c59ff8612c6873d014f6fb36` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 1fc6eb0c756b8be693b72e9e636ae5e236dcb6ee` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 03ced5da6120965d80ed56dbb7d78fa5c9128906` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before a832d7cb09da2a8e4e9734b4be14d3e76169d805` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before b7f10d4ff987bda038df90052cd4a1434a7412d4` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before cd7e875b89597f3498917af764758391338d1802` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 7e1208c135618358da5d7d6664874dc6e53c62fc` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before b17cf742eaad70ae29ac558cefb3aa9bbeea03d4` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.18`
  - unaffected: `before 4.18` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.187 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.156 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.108 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

## 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:** 0.0018, the 7th 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-2026-80852](https://www.cve.org/CVERecord?id=CVE-2026-80852)
- [NVD: CVE-2026-80852](https://nvd.nist.gov/vuln/detail/CVE-2026-80852)

### References from the CNA

- <https://git.kernel.org/stable/c/bc09411a11b5a676c59ff8612c6873d014f6fb36>
- <https://git.kernel.org/stable/c/1fc6eb0c756b8be693b72e9e636ae5e236dcb6ee>
- <https://git.kernel.org/stable/c/03ced5da6120965d80ed56dbb7d78fa5c9128906>
- <https://git.kernel.org/stable/c/a832d7cb09da2a8e4e9734b4be14d3e76169d805>
- <https://git.kernel.org/stable/c/b7f10d4ff987bda038df90052cd4a1434a7412d4>
- <https://git.kernel.org/stable/c/fadbc1ed2a872a8649a44cf9e1cf9621fc58cd6e>
- <https://git.kernel.org/stable/c/cd7e875b89597f3498917af764758391338d1802>
- <https://git.kernel.org/stable/c/7e1208c135618358da5d7d6664874dc6e53c62fc>
- <https://git.kernel.org/stable/c/b17cf742eaad70ae29ac558cefb3aa9bbeea03d4>

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-2026-80852>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80852/>. Everything for agents: <https://agentprime.io/llms.txt>.