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CVE-2026-90252— Bluetooth: MGMT: free the HCI command when it is cancelled

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux 内核中，以下漏洞已得到修复： 蓝牙 MGMT 子系统中，当 HCI 命令被取消时，应释放该命令。 在排队等待的命令时传入了一个为空的销毁（destroy）回调，因此只有在 执行时才会释放该命令。当某个条目被取消时，该条目会发生内存泄漏，因为 在不存在销毁回调的情况下不会释放 。此外，当控制器注销时， 会取消所有处于挂起状态的条目。由于没有其他代码回收该命令： 并不会将命令放入 队列中。 该内存泄漏还会固定（pin）由 获取的套接字引用，导致 MGMT 套接字永远无法被释放。 解决方案：通过销毁回调来释放

AI Predicted 5.5 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 827af4787e74e8df9e8e0677a69fbb15e0856d2f< e0cd7b34dc6b5414cac3d4cd376f73d3e9ffbd93 affected
827af4787e74e8df9e8e0677a69fbb15e0856d2f< 481533b03985177ddc805e0bd12fc07e7adf9040 affected
827af4787e74e8df9e8e0677a69fbb15e0856d2f< 414b365ecea6c30357adee6b8a7c5edc03a03575 affected
6.13 affected
< 6.13 unaffected
6.18.52≤ 6.18.* unaffected
7.2.6≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-90252

Vulnerability Information
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Vulnerability Title
Bluetooth: MGMT: free the HCI command when it is cancelled
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: free the HCI command when it is cancelled mgmt_hci_cmd_sync() queues the pending command with a NULL destroy callback, so it is only freed if send_hci_cmd_sync() runs. A cancelled entry is leaked, as _hci_cmd_sync_cancel_entry() does not release entry->data when there is no destroy callback, and hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. Nothing else reclaims it either: mgmt_pending_new() does not put the command on hdev->mgmt_pending. The leak also pins the socket reference taken by mgmt_pending_new(), so the mgmt socket is never released. Free the command from a destroy callback. The now-empty done label is replaced by a direct return.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 827af4787e74e8df9e8e0677a69fbb15e0856d2f ~ e0cd7b34dc6b5414cac3d4cd376f73d3e9ffbd93 -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-90252

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III. Intelligence Information for CVE-2026-90252

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Patches & Fixes for CVE-2026-90252 (2)

Other References for CVE-2026-90252 (1)

Same Patch Batch · Linux · 2026-09-17 · 602 CVEs total

CVE-2026-90257 Bluetooth: virtio_bt: avoid OOB read of build info string
CVE-2026-90238 media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
CVE-2026-90240 iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90239 media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
CVE-2026-90241 iommu/vt-d: Tear down scalable-mode context on probe failure
CVE-2026-90243 iommu/vt-d: Clear Present bit before tearing down copied context entry
CVE-2026-90242 iommu/vt-d: Fix iopf_refcount leak on RID domain replacement
CVE-2026-90244 iommu/dma: Restore locking around msi_page_list
CVE-2026-90245 fbdev: kyro: Validate overlay viewport coordinates
CVE-2026-90246 apparmor: fix integer overflow in verify_tags() bounds check
CVE-2026-90247 bpf: Fix mmap_lock leak in irq_work path
CVE-2026-90248 net/sched: cls_api: fix teardown of an adopted proto on insert-race loss
CVE-2026-90249 iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes
CVE-2026-90250 bpf, cgroup: Fix storage null-ptr-deref after replacing prog
CVE-2026-90251 Bluetooth: MSFT: validate evt_prefix_len against the response length
CVE-2026-90253 Bluetooth: MGMT: free the mesh send cancel command when it is cancelled
CVE-2026-90254 Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
CVE-2026-90256 Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90267 scsi: sd: Fix special_vec mempool leak when scsi_alloc_sgtables() fails

Showing top 20 of 602 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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