CVE-2026-53252

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: fix memory leak in error path of hci_alloc_dev()

Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory.

When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev).

Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory.

Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.

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
3%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 8, 2026

Advisory Details (7)

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

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81
generic

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889
generic

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa
generic

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309
generic

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd
generic

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f
generic

Bluetooth: fix memory leak in error path of hci_alloc_dev() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184

Vendor Advisories for CVE-2026-53252(2)

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

(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.

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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 206 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53252?
CVE-2026-53252 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hciallocdev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hciregisterdev() completes, the HCI_UNREGISTER flag is…
When was CVE-2026-53252 disclosed?
CVE-2026-53252 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-2026-53252 actively exploited?
CVE-2026-53252 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-53252?
CVE-2026-53252 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53252?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53252, 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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