CVE-2026-53252
Description
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.
Affected products
21cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 13 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.10.259,<5.11
- cpe:2.3:o:linux:linux_kernel:5.15.209:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.16:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*
- (no CPE)
- osv-coords7 versionspkg:apk/chainguard/linux-azure-6.18pkg:apk/chainguard/linux-gcp-6.18pkg:apk/chainguard/linux-gcp-6.18-bootc-boot-installedpkg:apk/chainguard/linux-qemu-6.18pkg:apk/chainguard/linux-qemu-6.18-bootc-boot-installedpkg:apk/chainguard/linux-qemu-melangepkg:linux/kernel
< 6.18.38-r0+ 6 more
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 5.15.210
Patches
Vulnerability mechanics
References
7- git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184nvdPatch
- git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37fnvdPatch
- git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fdnvdPatch
- git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309nvdPatch
- git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aanvdPatch
- git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889nvdPatch
- git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81nvdPatch
News mentions
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