# net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

CVE record · `CVE-2026-98491`

- **Identifiers:** `CVE-2026-98491`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 18 Oct 2026
- **Updated:** 24 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:16 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: `cae3a2627520c3795b54533c5328b77af3405dbe to before e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 37e3c878b183a115f9a114067f9ef3b408ad27fb` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 707c2dc77891a874f4e8c52c285a511079164ec8` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before de41ee24f77b0fc45397db3e277cae2adbd43dfe` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 55e5256adf3940e71802e2f749cacf81518726b0` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before e2829ae5459ddb5fce526b2e84697edf6c0c3cef` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 26b2bd70d22457556e2fa01cbf1192cb1a94d619` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.3`
  - unaffected: `before 4.3` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th percentile, on 8 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-2026-98491](https://www.cve.org/CVERecord?id=CVE-2026-98491)
- [NVD: CVE-2026-98491](https://nvd.nist.gov/vuln/detail/CVE-2026-98491)

### References from the CNA

- <https://git.kernel.org/stable/c/e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d>
- <https://git.kernel.org/stable/c/37e3c878b183a115f9a114067f9ef3b408ad27fb>
- <https://git.kernel.org/stable/c/707c2dc77891a874f4e8c52c285a511079164ec8>
- <https://git.kernel.org/stable/c/de41ee24f77b0fc45397db3e277cae2adbd43dfe>
- <https://git.kernel.org/stable/c/55e5256adf3940e71802e2f749cacf81518726b0>
- <https://git.kernel.org/stable/c/e2829ae5459ddb5fce526b2e84697edf6c0c3cef>
- <https://git.kernel.org/stable/c/457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55>
- <https://git.kernel.org/stable/c/26b2bd70d22457556e2fa01cbf1192cb1a94d619>

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-2026-98491>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98491/>. Everything for agents: <https://agentprime.io/llms.txt>.