CVE-2026-72019

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: 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:

macsec: don't read an unset MAC header in macsec_encrypt()

macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG.

On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame's outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header().

On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d ("macvlan: do not assume mac_header is set in macvlan_broadcast()") for exactly this purpose.

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 19, 2026

Advisory Details (6)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

macsec: don't read an unset MAC header in macsec_encrypt() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f5089008f90c0a7c5520dff3934e0af00adf322d
generic

macsec: don't read an unset MAC header in macsec_encrypt() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f21fa533a3ed15ada74106aac4b9ddd078fc6b7a
generic

macsec: don't read an unset MAC header in macsec_encrypt() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e17a42199824973cd8212e95b21ffadf4114a21b
generic

macsec: don't read an unset MAC header in macsec_encrypt() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dc9ffa1905e72f026d080880a2e4cfc42aa91000
generic

macsec: don't read an unset MAC header in macsec_encrypt() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c39087ad0b97fc11a3b058dfc8db9fd370762cb9
generic

macsec: don't read an unset MAC header in macsec_encrypt() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2cf10d042562283ff4ae97c02d0993d4f1b5ea29

Vendor Advisories for CVE-2026-72019(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 32× in last 7d / 32× 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. 2026-08-21 03:38 UTCEG score recompute
  2. 2026-08-21 03:38 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 16:18 UTCGHSA enrichment
  5. 2026-08-20 04:59 UTCGHSA enrichment
  6. 2026-08-19 17:39 UTCEG score recompute
  7. 2026-08-19 17:39 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 16:46 UTCEG score recompute
  10. 2026-08-19 16:46 UTCGHSA enrichment
  11. 2026-08-19 16:32 UTCGHSA enrichment
  12. 2026-08-19 05:12 UTCGHSA enrichment
  13. 2026-08-18 17:50 UTCGHSA enrichment
  14. 2026-08-18 06:22 UTCGHSA enrichment
  15. 2026-08-17 19:03 UTCEG score recompute
  16. 2026-08-17 19:02 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 06:30 UTCEG score recompute
  19. 2026-08-17 06:30 UTCGHSA enrichment
  20. 2026-08-17 06:01 UTCEG score recompute▲ 7.30
  21. 2026-08-17 06:01 UTCGHSA enrichment
  22. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 7.3 · severity → HIGH
  23. 2026-08-17 05:34 UTCEG score recompute
  24. 2026-08-17 05:34 UTCGHSA enrichment
  25. 2026-08-17 05:24 UTCMITRE cvelistV5
Show 7 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 02:15 UTCEPSS rescore
  4. 2026-08-15 06:46 UTCGHSA enrichment
  5. 2026-08-15 06:23 UTCNVD update
  6. 2026-08-15 06:19 UTCEG score recompute
  7. 2026-08-15 06:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72019?
CVE-2026-72019 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: macsec: don't read an unset MAC header in macsec_encrypt() macsecencrypt() reads the Ethernet header via ethhdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the…
When was CVE-2026-72019 disclosed?
CVE-2026-72019 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72019 actively exploited?
CVE-2026-72019 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.5% of all scored CVEs.
What is the CVSS score of CVE-2026-72019?
CVE-2026-72019 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-72019?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72019, 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.

Dependency Blast Radius

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