CVE-2026-53251

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync

hci_get_route() returns a reference-counted hci_dev pointer via hci_dev_hold(). The function exits normally or with an error without ever releasing it.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5cbf290b79351971f20c7a533247e8d58a3f970c
generic

Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4bbec25f47b930101294fd310c627c3f53e9661f
generic

Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/33d677d2e3713d98012c3dbd4a9207f7d785b854
generic

Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/23e8eb16820b866528fb300dc67fe3f67f00ef62

Vendor Advisories for CVE-2026-53251(1)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-18ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-18ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
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.

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 42× 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 165 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 07:29 UTCEG score recompute
  3. 2026-09-18 07:29 UTCVendor advisory
  4. 2026-09-18 07:29 UTCGHSA enrichment
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-14 01:23 UTCEG score recompute
  8. 2026-09-14 01:23 UTCVendor advisory
  9. 2026-09-14 01:23 UTCGHSA enrichment
  10. 2026-09-13 16:47 UTCEPSS rescore
  11. 2026-09-12 15:55 UTCEG score recompute
  12. 2026-09-12 15:55 UTCVendor advisory
  13. 2026-09-12 15:55 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-10 09:35 UTCEPSS rescore
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-07 16:01 UTCEPSS rescore
  18. 2026-09-06 13:47 UTCEPSS rescore
  19. 2026-09-04 05:06 UTCEPSS rescore
  20. 2026-09-02 14:12 UTCEPSS rescore
  21. 2026-09-01 13:54 UTCEPSS rescore
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-08-30 19:37 UTCEG score recompute
  24. 2026-08-30 19:37 UTCGHSA enrichment
  25. 2026-08-30 19:17 UTCEPSS rescore
Show 75 more
  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-28 21:41 UTCEPSS rescore
  3. 2026-08-27 23:58 UTCEG score recompute
  4. 2026-08-27 23:58 UTCGHSA enrichment
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-25 13:49 UTCEPSS rescore
  8. 2026-08-24 13:19 UTCEG score recompute
  9. 2026-08-24 13:19 UTCGHSA enrichment
  10. 2026-08-23 12:00 UTCEG score recompute
  11. 2026-08-23 12:00 UTCGHSA enrichment
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 10:42 UTCEG score recompute
  14. 2026-08-22 10:42 UTCGHSA enrichment
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-21 08:26 UTCEG score recompute
  17. 2026-08-21 08:26 UTCGHSA enrichment
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 07:07 UTCEG score recompute
  20. 2026-08-20 07:07 UTCGHSA enrichment
  21. 2026-08-19 17:04 UTCEPSS rescore
  22. 2026-08-19 01:31 UTCEG score recompute
  23. 2026-08-19 01:31 UTCGHSA enrichment
  24. 2026-08-18 13:48 UTCEPSS rescore
  25. 2026-08-17 13:47 UTCEPSS rescore
  26. 2026-08-17 07:37 UTCEG score recompute
  27. 2026-08-17 07:37 UTCGHSA enrichment
  28. 2026-08-16 14:56 UTCEPSS rescore
  29. 2026-08-16 06:19 UTCEG score recompute
  30. 2026-08-16 06:19 UTCGHSA enrichment
  31. 2026-08-16 02:14 UTCEPSS rescore
  32. 2026-08-15 05:01 UTCEG score recompute
  33. 2026-08-15 05:01 UTCGHSA enrichment
  34. 2026-08-15 01:30 UTCEPSS rescore
  35. 2026-08-14 03:41 UTCEG score recompute
  36. 2026-08-14 03:41 UTCGHSA enrichment
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 02:23 UTCEG score recompute
  39. 2026-08-13 02:23 UTCGHSA enrichment
  40. 2026-08-12 13:51 UTCEPSS rescore
  41. 2026-08-12 01:04 UTCEG score recompute
  42. 2026-08-12 01:04 UTCGHSA enrichment
  43. 2026-08-11 00:00 UTCEPSS rescore
  44. 2026-08-10 23:44 UTCGHSA enrichment
  45. 2026-08-09 22:25 UTCEG score recompute
  46. 2026-08-09 22:25 UTCGHSA enrichment
  47. 2026-08-09 13:46 UTCEPSS rescore
  48. 2026-08-08 21:07 UTCEG score recompute
  49. 2026-08-08 21:07 UTCGHSA enrichment
  50. 2026-08-08 16:37 UTCEPSS rescore
  51. 2026-08-07 19:48 UTCEG score recompute
  52. 2026-08-07 19:48 UTCGHSA enrichment
  53. 2026-08-06 18:29 UTCEG score recompute
  54. 2026-08-06 18:29 UTCGHSA enrichment
  55. 2026-08-06 13:47 UTCEPSS rescore
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-05 17:10 UTCEG score recompute
  58. 2026-08-05 17:10 UTCGHSA enrichment
  59. 2026-08-04 15:10 UTCEPSS rescore
  60. 2026-08-04 15:07 UTCEG score recompute
  61. 2026-08-04 15:07 UTCGHSA enrichment
  62. 2026-08-04 10:39 UTCEPSS rescore
  63. 2026-08-03 10:36 UTCEPSS rescore
  64. 2026-08-03 07:52 UTCGHSA enrichment
  65. 2026-08-02 05:58 UTCEG score recompute
  66. 2026-08-02 05:58 UTCGHSA enrichment
  67. 2026-08-02 02:27 UTCEPSS rescore
  68. 2026-08-01 04:40 UTCEG score recompute
  69. 2026-08-01 04:40 UTCGHSA enrichment
  70. 2026-08-01 04:16 UTCEPSS rescore
  71. 2026-07-31 03:19 UTCEG score recompute
  72. 2026-07-31 03:19 UTCGHSA enrichment
  73. 2026-07-30 16:28 UTCEPSS rescore
  74. 2026-07-30 01:30 UTCEPSS rescore
  75. 2026-07-30 01:13 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-53251?
CVE-2026-53251 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix not releasing hdev reference on isoconnbig_sync hcigetroute() returns a reference-counted hci_dev pointer via hcidevhold(). The function exits normally or with an error without ever releasing it.
When was CVE-2026-53251 disclosed?
CVE-2026-53251 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53251 actively exploited?
CVE-2026-53251 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 94.2% of all scored CVEs.
What is the CVSS score of CVE-2026-53251?
CVE-2026-53251 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53251?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53251, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53251

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