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
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

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
5.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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%
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

Published

June 25, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Patch available.
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(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-23ubuntu
ubuntulinux-tools-ibm-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1011.11) @ resolute2026-09-23ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-09-23ubuntu

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 rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (146 versions)
  • every version up to 7.0.13-1: fixed in 7.0.13-1
—

Weakness Classification(1)

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

All Vendor Advisories

(10)

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 6× in last 7d / 34× 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 185 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 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 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-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?
A fix for CVE-2026-53251 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53251 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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