CVE-2026-80721

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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:

Bluetooth: ISO: ensure no dangling hcon references in iso_conn

After iso_conn_del(), ISO sockets should not dereference the hcon any more. Currently, clearing iso_conn::hcon relies on iso_conn_del() releasing the last reference to the iso_conn.

Simplify this by explicitly clearing conn->hcon in iso_conn_del(), to avoid more complex reasoning on races about who holds the last reference.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 29, 2026

Advisory Details (3)

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

Bluetooth: ISO: ensure no dangling hcon references in iso_conn - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb
generic

Bluetooth: ISO: ensure no dangling hcon references in iso_conn - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cdce8af9291d8a1f8916c271de029bf558d9e8ec
generic

Bluetooth: ISO: ensure no dangling hcon references in iso_conn - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e941799c31f68e67ce0976efb38a79101f921b64

Vendor Advisories for CVE-2026-80721(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 14× in last 7d / 14× 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 05:54 UTCEG score recompute
  2. 2026-08-30 05:54 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 18:41 UTCEG score recompute
  5. 2026-08-29 18:41 UTCGHSA enrichment
  6. 2026-08-29 07:25 UTCEG score recompute
  7. 2026-08-29 07:24 UTCGHSA enrichment
  8. 2026-08-29 06:35 UTCEG score recompute▲ 8.80
  9. 2026-08-29 06:35 UTCGHSA enrichment
  10. 2026-08-29 06:33 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 08:20 UTCNVD update
  13. 2026-08-28 07:34 UTCEG score recompute
  14. 2026-08-28 07:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-80721?
CVE-2026-80721 is a high vulnerability published on August 28, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: ensure no dangling hcon references in iso_conn After isoconndel(), ISO sockets should not dereference the hcon any more. Currently, clearing isoconn::hcon relies on isoconn_del() releasing the last reference to the…
When was CVE-2026-80721 disclosed?
CVE-2026-80721 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-2026-80721 actively exploited?
CVE-2026-80721 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 86.9% of all scored CVEs.
What is the CVSS score of CVE-2026-80721?
CVE-2026-80721 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-80721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80721, 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

Explore the affected products and dependency analysis for CVE-2026-80721

Explore →

Is Your Infrastructure Affected by CVE-2026-80721?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs