# net/sched: fix use-after-free in \_\_tcf_action_put()

CVE record · `CVE-2026-99167`

- **Identifiers:** `CVE-2026-99167`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Oct 2026
- **Updated:** 31 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Oct 2026, 10:35 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: `16af6067392c40e454e49eec834843ab03643d96 to before 4d83a3fc03bc595dd39b79ad61288738fbb1f2ba` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before fd01abed2568209f7daaf60e5ee68ae4a4744f48` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before fcc7d734ceccfab8ec3398c5b34f8e775d459507` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before fde33eb9955d819af282d5f5e84684eaec248291` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before 969ad6f2b266f383b44194d50d15631969b26222` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before 2465d27ef90de9105c2bffb6c35f8ce08918e642` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before 2e012e431aa271ef3c84206f48854f539c03bff0` (git)
  - affected: `16af6067392c40e454e49eec834843ab03643d96 to before 7b16eb911091aae237a8673da94e4dfb9cd21d54` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.19`
  - unaffected: `before 4.19` (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: `6.6.161 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.13 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 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Oct 2026, 10:35 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99167)

## Sources

- [CVE List: CVE-2026-99167](https://www.cve.org/CVERecord?id=CVE-2026-99167)
- [NVD: CVE-2026-99167](https://nvd.nist.gov/vuln/detail/CVE-2026-99167)

### References from the CNA

- <https://git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba>
- <https://git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48>
- <https://git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507>
- <https://git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291>
- <https://git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222>
- <https://git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642>
- <https://git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0>
- <https://git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54>

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-2026-99167>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99167/>. Everything for agents: <https://agentprime.io/llms.txt>.