CVE-2026-74744

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev

ipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(), but leave needed_headroom and needed_tailroom set to 0.

When the underlying phy_dev (or stacked lower device) requires extra headroom or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx headroom), upper layers calculating packet headroom and tailroom fail to reserve sufficient space.

This can result in reallocation overhead, skb headroom underflows, or KASAN slab-use-after-free crashes when dev_hard_header() / ipvlan_hard_header() prepends header data or when lower devices append tailroom.

Fix this by:

  • Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init().
  • Propagating needed_headroom and needed_tailroom updates to attached ipvlans
in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 27, 2026

Advisory Details (6)

Auto-updated Aug 27, 2026
No patch confirmed yet.
generic

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f3c17ff65f54781cde696e16a6c577615ed735aa
generic

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e16e960d55a40d36bd7c2494cc005e757dc9a1ef
generic

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c0fbe31f6b20ade0465130685859faa5c86fda59
generic

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/af602c4d0ee548da18e2409b4b4da1079625a372
generic

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5f33188457bbcc1b11ca87084037963c516ed3d9
generic

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5c2ca77212eb38559b0353b8363b7a84f4b019dd

Vendor Advisories for CVE-2026-74744(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 28× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 06:30 UTCGHSA enrichment
  2. 2026-08-30 02:09 UTCEG score recompute
  3. 2026-08-30 02:09 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-29 21:49 UTCGHSA enrichment
  6. 2026-08-29 17:29 UTCGHSA enrichment
  7. 2026-08-29 13:06 UTCGHSA enrichment
  8. 2026-08-29 08:43 UTCGHSA enrichment
  9. 2026-08-29 04:20 UTCGHSA enrichment
  10. 2026-08-28 23:58 UTCEG score recompute
  11. 2026-08-28 23:58 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 17:24 UTCGHSA enrichment
  14. 2026-08-28 12:58 UTCGHSA enrichment
  15. 2026-08-28 08:35 UTCGHSA enrichment
  16. 2026-08-28 04:06 UTCGHSA enrichment
  17. 2026-08-27 23:44 UTCGHSA enrichment
  18. 2026-08-27 19:24 UTCGHSA enrichment
  19. 2026-08-27 15:03 UTCEG score recompute
  20. 2026-08-27 15:03 UTCGHSA enrichment
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-27 10:43 UTCEG score recompute
  23. 2026-08-27 10:43 UTCGHSA enrichment
  24. 2026-08-27 06:22 UTCEG score recompute▲ 9.80
  25. 2026-08-27 06:11 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
Show 3 more
  1. 2026-08-26 15:43 UTCNVD update
  2. 2026-08-26 14:44 UTCEG score recompute
  3. 2026-08-26 14:41 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74744?
CVE-2026-74744 is a critical vulnerability published on August 26, 2026. In the Linux kernel, the following vulnerability has been resolved: ipvlan: inherit neededheadroom and neededtailroom from phy_dev ipvlan devices inherit hardheaderlen from phydev during ipvlaninit(), but leave neededheadroom and neededtailroom set to 0. When the underlying phy_dev (or stacked…
When was CVE-2026-74744 disclosed?
CVE-2026-74744 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74744 actively exploited?
CVE-2026-74744 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.1% of all scored CVEs.
What is the CVSS score of CVE-2026-74744?
CVE-2026-74744 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74744?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74744, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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