# macvlan: inherit needed_headroom and needed_tailroom from lowerdev

CVE record · `CVE-2026-74743`

- **Identifiers:** `CVE-2026-74743`
- **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:** 26 Aug 2026
- **Updated:** 16 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 26 Aug 2026, 14:36 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: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before c2ef3f134b069c54b9cc95cce1a16c38c4939336` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before 7b0eb3e0f363ca79a3af9efd2e87c6258f11da2b` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before 8cd90e850e434577bf6774778657d26d6995e53f` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before 28afc87bd8da0b3348bbbd834c8a89e83712cf5e` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before 8f6a05dbac05725e0786701eb04778c5bdbe4eaa` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before 96fa90b74385b7f2b0d97251dd43d5ee6ca44668` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before bc9a00fb78e32bccc39d763bfd13a450705bac5d` (git)
  - affected: `b863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 to before cef51860becd9700217c81732ca1eb1ea6ed6fe1` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.23`
  - unaffected: `before 2.6.23` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.184 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.153 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.105 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.46 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.10 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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:** 0.0054, the 45th percentile, on 15 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 26 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-74743](https://www.cve.org/CVERecord?id=CVE-2026-74743)
- [NVD: CVE-2026-74743](https://nvd.nist.gov/vuln/detail/CVE-2026-74743)

### References from the CNA

- <https://git.kernel.org/stable/c/c2ef3f134b069c54b9cc95cce1a16c38c4939336>
- <https://git.kernel.org/stable/c/7b0eb3e0f363ca79a3af9efd2e87c6258f11da2b>
- <https://git.kernel.org/stable/c/8cd90e850e434577bf6774778657d26d6995e53f>
- <https://git.kernel.org/stable/c/28afc87bd8da0b3348bbbd834c8a89e83712cf5e>
- <https://git.kernel.org/stable/c/8f6a05dbac05725e0786701eb04778c5bdbe4eaa>
- <https://git.kernel.org/stable/c/96fa90b74385b7f2b0d97251dd43d5ee6ca44668>
- <https://git.kernel.org/stable/c/bc9a00fb78e32bccc39d763bfd13a450705bac5d>
- <https://git.kernel.org/stable/c/cef51860becd9700217c81732ca1eb1ea6ed6fe1>

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-2026-74743>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74743/>. Everything for agents: <https://agentprime.io/llms.txt>.