CVE-2026-53209

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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: hci_sync: reject oversized Broadcast Announcement prepend

Existing advertising instances can already hold the maximum extended advertising payload. When hci_adv_bcast_annoucement() prepends the Broadcast Announcement service data to that payload, the combined data may no longer fit in the temporary buffer used to rebuild the advertising data.

Reject that case before copying the existing payload and report the failure through the device log. This keeps the existing advertising data intact and avoids overrunning the temporary buffer.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 25, 2026

Last Modified

August 5, 2026

Advisory Details (6)

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

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253
generic

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62
generic

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758
generic

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7d
generic

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862
generic

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1

Vendor Advisories for CVE-2026-53209(3)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (145 versions)7.0.13-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 85× 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.

Showing the most recent 100 of 300 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 16:01 UTCEPSS rescore
  5. 2026-09-06 13:47 UTCEPSS rescore
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 13:54 UTCEPSS rescore
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-08-30 19:38 UTCEG score recompute
  11. 2026-08-30 19:38 UTCVendor advisory
  12. 2026-08-30 19:38 UTCGHSA enrichment
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-28 21:41 UTCEPSS rescore
  16. 2026-08-27 23:59 UTCEG score recompute
  17. 2026-08-27 23:59 UTCVendor advisory
  18. 2026-08-27 23:59 UTCGHSA enrichment
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 14:46 UTCEPSS rescore
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-25 00:22 UTCEG score recompute
  23. 2026-08-25 00:22 UTCVendor advisory
  24. 2026-08-25 00:22 UTCGHSA enrichment
  25. 2026-08-24 13:13 UTCEG score recompute
Show 75 more
  1. 2026-08-24 13:13 UTCVendor advisory
  2. 2026-08-24 13:13 UTCGHSA enrichment
  3. 2026-08-23 20:46 UTCVendor advisory
  4. 2026-08-23 20:46 UTCGHSA enrichment
  5. 2026-08-23 09:37 UTCEG score recompute
  6. 2026-08-23 09:37 UTCVendor advisory
  7. 2026-08-23 09:37 UTCGHSA enrichment
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-22 22:28 UTCVendor advisory
  10. 2026-08-22 22:28 UTCGHSA enrichment
  11. 2026-08-22 10:42 UTCEG score recompute
  12. 2026-08-22 10:42 UTCVendor advisory
  13. 2026-08-22 10:42 UTCGHSA enrichment
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 17:26 UTCGHSA enrichment
  16. 2026-08-21 05:28 UTCEG score recompute
  17. 2026-08-21 05:28 UTCVendor advisory
  18. 2026-08-21 05:28 UTCGHSA enrichment
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-20 18:20 UTCVendor advisory
  21. 2026-08-20 18:20 UTCGHSA enrichment
  22. 2026-08-20 07:08 UTCEG score recompute
  23. 2026-08-20 07:08 UTCVendor advisory
  24. 2026-08-20 07:08 UTCGHSA enrichment
  25. 2026-08-19 17:04 UTCEPSS rescore
  26. 2026-08-19 12:41 UTCVendor advisory
  27. 2026-08-19 12:41 UTCGHSA enrichment
  28. 2026-08-19 01:32 UTCEG score recompute
  29. 2026-08-19 01:32 UTCVendor advisory
  30. 2026-08-19 01:32 UTCGHSA enrichment
  31. 2026-08-18 13:48 UTCEPSS rescore
  32. 2026-08-17 13:47 UTCEPSS rescore
  33. 2026-08-17 06:11 UTCVendor advisory
  34. 2026-08-17 06:11 UTCGHSA enrichment
  35. 2026-08-16 18:25 UTCEG score recompute
  36. 2026-08-16 18:25 UTCVendor advisory
  37. 2026-08-16 18:25 UTCGHSA enrichment
  38. 2026-08-16 14:56 UTCEPSS rescore
  39. 2026-08-16 06:54 UTCEG score recompute
  40. 2026-08-16 06:54 UTCVendor advisory
  41. 2026-08-16 06:54 UTCGHSA enrichment
  42. 2026-08-16 02:14 UTCEPSS rescore
  43. 2026-08-15 19:46 UTCVendor advisory
  44. 2026-08-15 19:46 UTCGHSA enrichment
  45. 2026-08-15 08:38 UTCEG score recompute
  46. 2026-08-15 08:38 UTCVendor advisory
  47. 2026-08-15 08:38 UTCGHSA enrichment
  48. 2026-08-15 01:30 UTCEPSS rescore
  49. 2026-08-14 21:30 UTCVendor advisory
  50. 2026-08-14 21:30 UTCGHSA enrichment
  51. 2026-08-14 10:22 UTCVendor advisory
  52. 2026-08-14 10:22 UTCGHSA enrichment
  53. 2026-08-13 23:14 UTCEG score recompute
  54. 2026-08-13 23:14 UTCVendor advisory
  55. 2026-08-13 23:14 UTCGHSA enrichment
  56. 2026-08-13 22:00 UTCEPSS rescore
  57. 2026-08-13 12:05 UTCVendor advisory
  58. 2026-08-13 12:05 UTCGHSA enrichment
  59. 2026-08-13 00:57 UTCEG score recompute
  60. 2026-08-13 00:57 UTCGHSA enrichment
  61. 2026-08-12 13:51 UTCEPSS rescore
  62. 2026-08-12 13:49 UTCVendor advisory
  63. 2026-08-12 13:49 UTCGHSA enrichment
  64. 2026-08-12 02:41 UTCVendor advisory
  65. 2026-08-12 02:41 UTCGHSA enrichment
  66. 2026-08-11 15:33 UTCEG score recompute
  67. 2026-08-11 15:33 UTCVendor advisory
  68. 2026-08-11 15:33 UTCGHSA enrichment
  69. 2026-08-11 04:24 UTCEG score recompute
  70. 2026-08-11 04:24 UTCVendor advisory
  71. 2026-08-11 04:24 UTCGHSA enrichment
  72. 2026-08-11 00:00 UTCEPSS rescore
  73. 2026-08-10 17:16 UTCGHSA enrichment
  74. 2026-08-10 05:06 UTCVendor advisory
  75. 2026-08-10 05:06 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-53209?
CVE-2026-53209 is a high vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend Existing advertising instances can already hold the maximum extended advertising payload. When hciadvbcast_annoucement() prepends the Broadcast Announcement…
When was CVE-2026-53209 disclosed?
CVE-2026-53209 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53209 actively exploited?
CVE-2026-53209 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-53209?
CVE-2026-53209 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-53209?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53209, 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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