# net: openvswitch: conntrack: fix helper UAF due to extensions realloc

CVE record · `CVE-2026-98490`

- **Identifiers:** `CVE-2026-98490`
- **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:** 18 Oct 2026
- **Updated:** 30 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.

## 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: `cae3a2627520c3795b54533c5328b77af3405dbe to before f53d13a286fb275bda0efdf445b8a1e4dfcb717b` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 84d47a83b7b717576de0defab46b8823a22853b0` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 9f308197395c1a524b736e401cbc8a2ed7d246c9` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 18866dc1f525f9ee4de7709529d1ae1af8d8e8be` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before afcf362625190c5260530b1d6c7daa98831f6b83` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 5f23080a625dd7855ab91485c8d691a54a1979f0` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before e02a83bb0b7a203f6a22f55ad5f426765560f811` (git)
  - affected: `cae3a2627520c3795b54533c5328b77af3405dbe to before 1a4151e6be57b098b7a5ebfbde58585e83200cdc` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.3`
  - unaffected: `before 4.3` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (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: `6.18.55 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

- 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:** 0.0069, the 53rd 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-2026-98490](https://www.cve.org/CVERecord?id=CVE-2026-98490)
- [NVD: CVE-2026-98490](https://nvd.nist.gov/vuln/detail/CVE-2026-98490)

### References from the CNA

- <https://git.kernel.org/stable/c/f53d13a286fb275bda0efdf445b8a1e4dfcb717b>
- <https://git.kernel.org/stable/c/84d47a83b7b717576de0defab46b8823a22853b0>
- <https://git.kernel.org/stable/c/9f308197395c1a524b736e401cbc8a2ed7d246c9>
- <https://git.kernel.org/stable/c/18866dc1f525f9ee4de7709529d1ae1af8d8e8be>
- <https://git.kernel.org/stable/c/afcf362625190c5260530b1d6c7daa98831f6b83>
- <https://git.kernel.org/stable/c/5f23080a625dd7855ab91485c8d691a54a1979f0>
- <https://git.kernel.org/stable/c/e02a83bb0b7a203f6a22f55ad5f426765560f811>
- <https://git.kernel.org/stable/c/1a4151e6be57b098b7a5ebfbde58585e83200cdc>

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-2026-98490>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98490/>. Everything for agents: <https://agentprime.io/llms.txt>.