# udp: fix potential use-after-free in tunnel segmentation

CVE record · `CVE-2026-74705`

- **Identifiers:** `CVE-2026-74705`
- **State:** Confirmed
- **Severity:** CVSS 10.0 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 22 Aug 2026
- **Updated:** 16 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 22 Aug 2026, 15:33 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 10.0: 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: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before 6a733a38b983d8c2e222f13968209010cf44de87` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before 19d89b13a43640b2da2f277ee462d919d988cb6f` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before b3df61bb745eb5201eac22679a2839d4ccbf3442` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before 1ae134c012e10384cdac420b5cc6e0615cde0b55` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before 5161e67c561c4f28a5d9335a6e859b02511de92b` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before 64d322c288577793eedd352b96ef75234ed380fe` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before 588d4a6795d99d080f74ef0b5f391ea8c453ae5d` (git)
  - affected: `dbef491ebe7f3a4fb1b9111878b86a426fd540b7 to before d0f86fb36eb260abd10007b62c9dcc1028e03e61` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.6`
  - unaffected: `before 4.6` (semver)
  - unaffected: `5.10.265 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.216 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.183 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.152 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.104 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.45 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.9 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0050, the 43rd percentile, on 15 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 22 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-74705](https://www.cve.org/CVERecord?id=CVE-2026-74705)
- [NVD: CVE-2026-74705](https://nvd.nist.gov/vuln/detail/CVE-2026-74705)

### References from the CNA

- <https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87>
- <https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f>
- <https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442>
- <https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55>
- <https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b>
- <https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe>
- <https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d>
- <https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61>

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-2026-74705>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74705/>. Everything for agents: <https://agentprime.io/llms.txt>.