Local service interruption via leaked Bluetooth SRCU memory
Published Jun 25, 2026 · Updated Jun 25, 2026
Memory leak in Linux Kernel Bluetooth HCI UART configuration allows local users to exhaust percpu memory through failed device initialization. The unregistered branch of bt_host_release() directly frees hdev without running hci_release_dev(), leaving the SRCU structure allocated by hci_alloc_dev() uncleared. Exploitation requires local low-privileged access and an HCI UART initialization failure before device registration, with availability loss from repeated memory consumption.
Summary
What happened
Memory leak in Linux Kernel Bluetooth HCI UART configuration allows local users to exhaust percpu memory through failed device initialization. The unregistered branch of bt_host_release() directly frees hdev without running hci_release_dev(), leaving the SRCU structure allocated by hci_alloc_dev() uncleared. Exploitation requires local low-privileged access and an HCI UART initialization failure before device registration, with availability loss from repeated memory consumption.
The record
- CVE
- CVE-2026-53252
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-401, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0e5c144c557df910ab64d9c25d06399a9a735e65
- Affected versionversion=1d6123102e9fbedc8d25bf4731da6d513173e49e <37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f
- Affected versionversion=1d6123102e9fbedc8d25bf4731da6d513173e49e <ce4b4cac3c5749b6aa75e62e2991ae2263f2f889
- Affected versionversion=1d6123102e9fbedc8d25bf4731da6d513173e49e <f82799407a50af7bcacacf09cc9b279af8fe9b81
- Affected versionversion=5.10.259 <5.11
- Affected versionversion=5.15.209 <5.15.210
- Affected versionversion=6.1.167 <6.1.176
- Affected versionversion=6.12.36 <6.12.94
- Affected versionversion=6.15.5 <6.16
- Affected versionversion=6.16
- Affected versionversion=6.6.97 <6.6.143
- Affected versionversion=90dee0a0ff84fac8accd5be98412b3819f667149 <5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd
- Affected versionversion=bc0819a25e04cd68ef3568cfa51b63118fea39a7 <0622e527a31d4b44737fed5c1a2ac1fc2cfb5184
- Affected versionversion=c56b177efce8b62798e4d96bdb9867106cb7c4a0 <c016118b9e51eeaf5bc93850d4c455a3b583c0aa
- Affected versionversion=ce23b73f0f27e2dbeb81734a79db710f05aa33c6 <bc2efe73c194a74839d7cf57b63880d97e21d309
- Affected versionversion=dd4becd3fd4102696e1c15e6d260a1712a2d8685
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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