CVE-2026-80681

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-28. 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:

vxlan: re-fetch eth header after route_shortcircuit()

Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).

Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head.

In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest.

Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().

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
41%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 29, 2026

Advisory Details (8)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5
generic

vxlan: re-fetch eth header after route_shortcircuit() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff

Vendor Advisories for CVE-2026-80681(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 17× in last 7d / 17× 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 05:10 UTCEG score recompute
  2. 2026-08-30 05:10 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-30 00:51 UTCGHSA enrichment
  5. 2026-08-29 20:31 UTCGHSA enrichment
  6. 2026-08-29 16:12 UTCGHSA enrichment
  7. 2026-08-29 11:51 UTCEG score recompute
  8. 2026-08-29 11:51 UTCGHSA enrichment
  9. 2026-08-29 07:26 UTCEG score recompute
  10. 2026-08-29 07:26 UTCGHSA enrichment
  11. 2026-08-29 06:36 UTCEG score recompute▲ 9.80
  12. 2026-08-29 06:36 UTCGHSA enrichment
  13. 2026-08-29 06:33 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  14. 2026-08-28 21:42 UTCEPSS rescore
  15. 2026-08-28 08:20 UTCNVD update
  16. 2026-08-28 07:34 UTCEG score recompute
  17. 2026-08-28 07:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-80681?
CVE-2026-80681 is a critical vulnerability published on August 28, 2026. In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before routeshortcircuit(), the eth header pointer is cached from ethhdr(skb). Inside routeshortcircuit(), pskbmay_pull() can be called, which may reallocate skb->head. In this…
When was CVE-2026-80681 disclosed?
CVE-2026-80681 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-80681 actively exploited?
CVE-2026-80681 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 59.0% of all scored CVEs.
What is the CVSS score of CVE-2026-80681?
CVE-2026-80681 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-80681?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80681, 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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