# net/sched: act_ct: fix helper UAF due to extensions realloc

CVE record · `CVE-2026-98442`

- **Identifiers:** `CVE-2026-98442`
- **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, 15:14 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: `a21b06e7319129994f339ed47f512bbe57b77f5b to before 31f5fe29a572037ee19c233dfe506849940c484b` (git)
  - affected: `a21b06e7319129994f339ed47f512bbe57b77f5b to before 1679bbf5fbeac52a310b1a58b2b301bbf388bdbf` (git)
  - affected: `a21b06e7319129994f339ed47f512bbe57b77f5b to before 812c16a255e7773a544e88b39ae6daed25544d30` (git)
  - affected: `a21b06e7319129994f339ed47f512bbe57b77f5b to before 8988f4d11f3fba0ab38122178836c683ad516a05` (git)
  - affected: `a21b06e7319129994f339ed47f512bbe57b77f5b to before dad19b59da050cb60d3f7023dac2a042a84bf0bd` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.2`
  - unaffected: `before 6.2` (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

- 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:** 0.0013, the 2nd percentile, on 9 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-2026-98442](https://www.cve.org/CVERecord?id=CVE-2026-98442)
- [NVD: CVE-2026-98442](https://nvd.nist.gov/vuln/detail/CVE-2026-98442)

### References from the CNA

- <https://git.kernel.org/stable/c/31f5fe29a572037ee19c233dfe506849940c484b>
- <https://git.kernel.org/stable/c/1679bbf5fbeac52a310b1a58b2b301bbf388bdbf>
- <https://git.kernel.org/stable/c/812c16a255e7773a544e88b39ae6daed25544d30>
- <https://git.kernel.org/stable/c/8988f4d11f3fba0ab38122178836c683ad516a05>
- <https://git.kernel.org/stable/c/dad19b59da050cb60d3f7023dac2a042a84bf0bd>

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-2026-98442>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98442/>. Everything for agents: <https://agentprime.io/llms.txt>.