# ppp_synctty: ensure a writeable skb header

CVE record · `CVE-2026-97964`

- **Identifiers:** `CVE-2026-97964`
- **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:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:23 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: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before 25e03eeead2c49748c7582dfb64c205f93a42d00` (git)
  - affected: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before a256f9925288ef47de8febed5c38d5cc21340211` (git)
  - affected: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before 7953946f68262a8bb137aa101249adef6e029652` (git)
  - affected: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before 3af7797fbabc84992e0ca5ad2bc0ca8537d053ef` (git)
  - affected: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before 0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e` (git)
  - affected: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before 15d0a6c9a42df2d745c37510dba828f6dbe60d9f` (git)
  - affected: `4cf476ced45d7f12df30a68e833b263e7a2202d1 to before 8aaeb56aff2a557a88f83ae866da2c91ad247e59` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.11`
  - unaffected: `before 5.11` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 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

## 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 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-2026-97964](https://www.cve.org/CVERecord?id=CVE-2026-97964)
- [NVD: CVE-2026-97964](https://nvd.nist.gov/vuln/detail/CVE-2026-97964)

### References from the CNA

- <https://git.kernel.org/stable/c/25e03eeead2c49748c7582dfb64c205f93a42d00>
- <https://git.kernel.org/stable/c/a256f9925288ef47de8febed5c38d5cc21340211>
- <https://git.kernel.org/stable/c/7953946f68262a8bb137aa101249adef6e029652>
- <https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef>
- <https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e>
- <https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f>
- <https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59>

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-2026-97964>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-97964/>. Everything for agents: <https://agentprime.io/llms.txt>.