CVE-2026-53252 (GCVE-0-2026-53252)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
Bluetooth: fix memory leak in error path of hci_alloc_dev()
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 90dee0a0ff84fac8accd5be98412b3819f667149 , < 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd (git)
Affected: c56b177efce8b62798e4d96bdb9867106cb7c4a0 , < c016118b9e51eeaf5bc93850d4c455a3b583c0aa (git)
Affected: bc0819a25e04cd68ef3568cfa51b63118fea39a7 , < 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 (git)
Affected: ce23b73f0f27e2dbeb81734a79db710f05aa33c6 , < bc2efe73c194a74839d7cf57b63880d97e21d309 (git)
Affected: 1d6123102e9fbedc8d25bf4731da6d513173e49e , < ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 (git)
Affected: 1d6123102e9fbedc8d25bf4731da6d513173e49e , < f82799407a50af7bcacacf09cc9b279af8fe9b81 (git)
Affected: 1d6123102e9fbedc8d25bf4731da6d513173e49e , < 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f (git)
Affected: dd4becd3fd4102696e1c15e6d260a1712a2d8685 (git)
Affected: 0e5c144c557df910ab64d9c25d06399a9a735e65 (git)
Affected: 5.15.209 , < 5.15.210 (semver)
Affected: 6.1.167 , < 6.1.176 (semver)
Affected: 6.6.97 , < 6.6.143 (semver)
Affected: 6.12.36 , < 6.12.94 (semver)
Affected: 5.10.259 , < 5.11 (semver)
Affected: 6.15.5 , < 6.16 (semver)
Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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As a result, when the device\\nreference count reaches zero, bt_host_release() evaluates this flag as\\nfalse and falls back to a direct kfree(hdev).\\n\\nBecause hci_release_dev() is bypassed, the SRCU struct initialized\\nearly in hci_alloc_dev() is never cleaned up, resulting in a leak of\\npercpu memory.\\n\\nFix the leak by explicitly calling cleanup_srcu_struct() in the\\nfallback (unregistered) branch of bt_host_release() before freeing\\nthe device.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hci_sysfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"90dee0a0ff84fac8accd5be98412b3819f667149\",\"lessThan\":\"5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c56b177efce8b62798e4d96bdb9867106cb7c4a0\",\"lessThan\":\"c016118b9e51eeaf5bc93850d4c455a3b583c0aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc0819a25e04cd68ef3568cfa51b63118fea39a7\",\"lessThan\":\"0622e527a31d4b44737fed5c1a2ac1fc2cfb5184\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce23b73f0f27e2dbeb81734a79db710f05aa33c6\",\"lessThan\":\"bc2efe73c194a74839d7cf57b63880d97e21d309\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1d6123102e9fbedc8d25bf4731da6d513173e49e\",\"lessThan\":\"ce4b4cac3c5749b6aa75e62e2991ae2263f2f889\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1d6123102e9fbedc8d25bf4731da6d513173e49e\",\"lessThan\":\"f82799407a50af7bcacacf09cc9b279af8fe9b81\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1d6123102e9fbedc8d25bf4731da6d513173e49e\",\"lessThan\":\"37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd4becd3fd4102696e1c15e6d260a1712a2d8685\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0e5c144c557df910ab64d9c25d06399a9a735e65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.209\",\"lessThan\":\"5.15.210\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.167\",\"lessThan\":\"6.1.176\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.97\",\"lessThan\":\"6.6.143\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.36\",\"lessThan\":\"6.12.94\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.259\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.15.5\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hci_sysfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.259\",\"versionEndExcluding\":\"5.11\",\"matchCriteriaId\":\"52F60680-8824-4BB5-AF9B-B593D23018AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.167\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"EA4D47D7-0677-4EA5-A70C-E66CDE321414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.97\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"8C5F210A-4D29-4A1A-A880-4FECCDC57247\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12.36\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"34DC91E5-0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  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.