# net: gue: reject invalid REMCSUM offsets

CVE record · `CVE-2026-98621`

- **Identifiers:** `CVE-2026-98621`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 18 Oct 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:19 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: `fe881ef11cf0220f118816181930494d484c4883 to before 4b9bc21b2396c396d88dd909caaf73d5be6ff593` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before 43efb1f997e976f386aa89716f55870cd2cff9ad` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before 1eeec0c51fd5598da44080ed96bbd9880021c28b` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before 1d664be4ca49d1696e85239236f4988dfc4653c3` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before 97f907203321eee2cc9132d5c9eb47698fb41d35` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before 40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before c20f755338ca234e523dfc943719f194dfc1f903` (git)
  - affected: `fe881ef11cf0220f118816181930494d484c4883 to before 2566866fc30965d915d0b52b5c3323b362619f0e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.0`
  - unaffected: `before 4.0` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (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: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.55 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.9 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:** 0.0022, the 12th percentile, on 7 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 18 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98621](https://www.cve.org/CVERecord?id=CVE-2026-98621)
- [NVD: CVE-2026-98621](https://nvd.nist.gov/vuln/detail/CVE-2026-98621)

### References from the CNA

- <https://git.kernel.org/stable/c/4b9bc21b2396c396d88dd909caaf73d5be6ff593>
- <https://git.kernel.org/stable/c/43efb1f997e976f386aa89716f55870cd2cff9ad>
- <https://git.kernel.org/stable/c/1eeec0c51fd5598da44080ed96bbd9880021c28b>
- <https://git.kernel.org/stable/c/1d664be4ca49d1696e85239236f4988dfc4653c3>
- <https://git.kernel.org/stable/c/97f907203321eee2cc9132d5c9eb47698fb41d35>
- <https://git.kernel.org/stable/c/40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f>
- <https://git.kernel.org/stable/c/c20f755338ca234e523dfc943719f194dfc1f903>
- <https://git.kernel.org/stable/c/2566866fc30965d915d0b52b5c3323b362619f0e>

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-2026-98621>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98621/>. Everything for agents: <https://agentprime.io/llms.txt>.