CVE-2026-53252Bluetooth: fix memory leak in error path of hci_alloc_dev()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Jun 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 90dee0a0ff84fac8accd5be98412b3819f667149 builds before 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd; from c56b177efce8b62798e4d96bdb9867106cb7c4a0 before c016118b9e51eeaf5bc93850d4c455a3b583c0aa; from bc0819a25e04cd68ef3568cfa51b63118fea39a7 before 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184; from ce23b73f0f27e2dbeb81734a79db710f05aa33c6 before bc2efe73c194a74839d7cf57b63880d97e21d309; from 1d6123102e9fbedc8d25bf4731da6d513173e49e before ce4b4cac3c5749b6aa75e62e2991ae2263f2f889; from 1d6123102e9fbedc8d25bf4731da6d513173e49e before f82799407a50af7bcacacf09cc9b279af8fe9b81; from 1d6123102e9fbedc8d25bf4731da6d513173e49e before 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f; dd4becd3fd4102696e1c15e6d260a1712a2d8685; and 7 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 5.10.259 before 5.11; from 6.1.167 before 6.1.176; from 6.6.97 before 6.6.143; from 6.12.36 before 6.12.94; from 6.15.5 before 6.16; from 6.16.1 before 6.18.36; from 6.19 before 7.0.13; 5.15.209; and 11 more ranges | NVD |
References
- https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fdpatch
- https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aapatch
- https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184patch
- https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309patch
- https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889patch
- https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81patch
- https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37fpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.