Bluetooth: fix memory leak in error path of hci_alloc_dev()

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Summary

CVECVE-2026-53252
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:43 UTC
Updated2026-07-08 16:48:59 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001890000 probability, percentile 0.086870000 (date 2026-07-04)

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 90dee0a0ff84fac8accd5be98412b3819f667149 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd git Not specified
CNA Linux Linux affected c56b177efce8b62798e4d96bdb9867106cb7c4a0 c016118b9e51eeaf5bc93850d4c455a3b583c0aa git Not specified
CNA Linux Linux affected bc0819a25e04cd68ef3568cfa51b63118fea39a7 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 git Not specified
CNA Linux Linux affected ce23b73f0f27e2dbeb81734a79db710f05aa33c6 bc2efe73c194a74839d7cf57b63880d97e21d309 git Not specified
CNA Linux Linux affected 1d6123102e9fbedc8d25bf4731da6d513173e49e ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 git Not specified
CNA Linux Linux affected 1d6123102e9fbedc8d25bf4731da6d513173e49e f82799407a50af7bcacacf09cc9b279af8fe9b81 git Not specified
CNA Linux Linux affected 1d6123102e9fbedc8d25bf4731da6d513173e49e 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f git Not specified
CNA Linux Linux affected dd4becd3fd4102696e1c15e6d260a1712a2d8685 git Not specified
CNA Linux Linux affected 0e5c144c557df910ab64d9c25d06399a9a735e65 git Not specified
CNA Linux Linux affected 5.15.209 5.15.210 semver Not specified
CNA Linux Linux affected 6.1.167 6.1.176 semver Not specified
CNA Linux Linux affected 6.6.97 6.6.143 semver Not specified
CNA Linux Linux affected 6.12.36 6.12.94 semver Not specified
CNA Linux Linux affected 5.10.259 5.11 semver Not specified
CNA Linux Linux affected 6.15.5 6.16 semver Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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