# ip6_tunnel: clear skb2->cb\[\] in ip6ip6_err()

CVE record · `CVE-2026-74597`

- **Identifiers:** `CVE-2026-74597`
- **State:** Confirmed
- **Severity:** CVSS 9.8 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, 15:31 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 9.8: 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: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before 44fe898df302e91c5ee5acbc71ffa74e78e6c183` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before 0dadb0620ab65949a8bc2439dd28ea3c942fe87d` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before b6816536a2990c0db44a26130a03e40b441e829b` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before 64e41736a26f37ab6215bc2e6df125df05aceb08` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before 484134e1eb07d700a73b1e4bbf3fb503e299be60` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before 4eb15c465337b18f44716c499cd6ad63eee0ad54` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before fbf40faa0414b753212494ad197542002e66ed9e` (git)
  - affected: `e490d1d85cf5e191791979e5f260d32eb4f703a8 to before f803c086399da277b5d0ff36a107d0f162751800` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.22`
  - unaffected: `before 2.6.22` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0054, the 46th 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-2026-74597](https://www.cve.org/CVERecord?id=CVE-2026-74597)
- [NVD: CVE-2026-74597](https://nvd.nist.gov/vuln/detail/CVE-2026-74597)

### References from the CNA

- <https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183>
- <https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d>
- <https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b>
- <https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08>
- <https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60>
- <https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54>
- <https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e>
- <https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800>

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-2026-74597>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74597/>. Everything for agents: <https://agentprime.io/llms.txt>.