CVE-2026-53276

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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: Fix a use-after-free of the hci_conn pointer

In iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is dropped: bis = iso_pi(sk)->conn->hcon; /* Release the socket before lookups since that requires hci_dev_lock * which shall not be acquired while holding sock_lock for proper * ordering. */ release_sock(sk); hci_dev_lock(bis->hdev);

During the unlocked window, could a concurrent close() destroy the connection and free the bis structure, causing hci_dev_lock(bis->hdev) to access memory after it is freed, fix this by using the hdev reference which was safely acquired via iso_conn_get_hdev().

CVSS v3
7.8
EG Score
7.8(high)
EPSS
2.2%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 30, 2026

Advisory Details (2)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f50331f2a1441ec49988832c3a95f2edacc47322
generic

Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d324b8aa20bd3c3394e3647dc22491d88f3f4e7a

Vendor Advisories for CVE-2026-53276(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 / 48× 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. 2026-07-07 01:57 UTCEG score recompute
  2. 2026-07-07 01:57 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 13:14 UTCEG score recompute
  6. 2026-07-06 13:14 UTCGHSA enrichment
  7. 2026-07-06 00:08 UTCEG score recompute
  8. 2026-07-06 00:08 UTCGHSA enrichment
  9. 2026-07-05 11:25 UTCEG score recompute
  10. 2026-07-05 11:25 UTCGHSA enrichment
  11. 2026-07-04 22:42 UTCEG score recompute
  12. 2026-07-04 22:42 UTCGHSA enrichment
  13. 2026-07-04 09:58 UTCEG score recompute
  14. 2026-07-04 09:58 UTCGHSA enrichment
  15. 2026-07-03 21:15 UTCEG score recompute
  16. 2026-07-03 21:15 UTCGHSA enrichment
  17. 2026-07-03 08:32 UTCEG score recompute
  18. 2026-07-03 08:32 UTCGHSA enrichment
  19. 2026-07-02 19:49 UTCEG score recompute
  20. 2026-07-02 19:49 UTCGHSA enrichment
  21. 2026-07-02 07:07 UTCEG score recompute
  22. 2026-07-02 07:07 UTCGHSA enrichment
  23. 2026-07-01 18:24 UTCEG score recompute
  24. 2026-07-01 18:24 UTCGHSA enrichment
  25. 2026-07-01 15:07 UTCEPSS rescore
Show 23 more
  1. 2026-07-01 05:42 UTCEG score recompute
  2. 2026-07-01 05:41 UTCGHSA enrichment
  3. 2026-06-30 23:22 UTCEPSS rescore
  4. 2026-06-30 16:58 UTCEG score recompute
  5. 2026-06-30 16:58 UTCGHSA enrichment
  6. 2026-06-30 04:14 UTCEG score recompute
  7. 2026-06-30 04:14 UTCGHSA enrichment
  8. 2026-06-29 15:31 UTCEG score recompute
  9. 2026-06-29 15:31 UTCGHSA enrichment
  10. 2026-06-29 14:06 UTCEPSS rescore
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-29 02:48 UTCEG score recompute
  13. 2026-06-29 02:48 UTCGHSA enrichment
  14. 2026-06-28 14:07 UTCEPSS rescore
  15. 2026-06-28 14:05 UTCEG score recompute▲ 7.80
  16. 2026-06-28 14:05 UTCGHSA enrichment
  17. 2026-06-28 07:52 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  18. 2026-06-28 04:56 UTCEPSS rescore
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-27 03:08 UTCEPSS rescore
  21. 2026-06-25 13:49 UTCEPSS rescore
  22. 2026-06-25 10:03 UTCEG score recompute
  23. 2026-06-25 10:03 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-53276?
CVE-2026-53276 is a high vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer In isosockrebind_bc(), the bis pointer is cached, then the socket lock is dropped: bis = iso_pi(sk)->conn->hcon; /* Release the socket before lookups since that requires…
When was CVE-2026-53276 disclosed?
CVE-2026-53276 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53276 actively exploited?
CVE-2026-53276 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53276?
CVE-2026-53276 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-53276?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53276, 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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