# ipv6: flowlabel: cap duplicate leases per socket

CVE record · `CVE-2026-97597`

- **Identifiers:** `CVE-2026-97597`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:22 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: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 42abef116bb2265eeccae55a0dc91a9f1546f74c` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0159f716d8adbe85951cdf008d0afe27d874eaa6` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6d917992c22b6029fc2dc1bd464b7f6709357161` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2f1a6dd5c80ceb902f50449efe899f29cd7918e3` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 467467bf4209f9f8add0c648bae763f92a0224c3` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8d6cd188508513503805c156165de38e4e4a8615` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.7 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.

> CVE-2026-97597 affects the Linux kernel's IPv6 flow label handling. Repeated flow label GET requests for one shareable label could grow a socket's lease list without bound, and an unprivileged local user could trigger this to consume host memory. The fix limits unprivileged leases per socket once the socket reaches FL_MAX_PER_SOCK leases, so upgrade to a fixed kernel version listed for your branch. The source gives few details on the exact impact.

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:** 0.0022, the 13th percentile, on 12 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 25 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-97597](https://www.cve.org/CVERecord?id=CVE-2026-97597)
- [NVD: CVE-2026-97597](https://nvd.nist.gov/vuln/detail/CVE-2026-97597)

### References from the CNA

- <https://git.kernel.org/stable/c/42abef116bb2265eeccae55a0dc91a9f1546f74c>
- <https://git.kernel.org/stable/c/0159f716d8adbe85951cdf008d0afe27d874eaa6>
- <https://git.kernel.org/stable/c/6d917992c22b6029fc2dc1bd464b7f6709357161>
- <https://git.kernel.org/stable/c/2f1a6dd5c80ceb902f50449efe899f29cd7918e3>
- <https://git.kernel.org/stable/c/467467bf4209f9f8add0c648bae763f92a0224c3>
- <https://git.kernel.org/stable/c/8d6cd188508513503805c156165de38e4e4a8615>

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-2026-97597>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97597/>. Everything for agents: <https://agentprime.io/llms.txt>.