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CVE-2026-90255— Bluetooth: hci_conn: fix the SCO setup context lifetime

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.

以下是该 Linux 内核漏洞描述的中文翻译： 在 Linux 内核中，已修复以下漏洞： 蓝牙：hci_conn：修复 SCO 建立上下文的生命周期问题 队列中入队了一个 ，但其 destroy 回调为 NULL。因此，只有当 实际执行时，该上下文才会被释放。如果条目被取消（cancelled）而非执行，则会发生内存泄漏，原因是当没有 destroy 回调时， 不会释放 ；而在控制器注销时， 会取消所有待处理条目。 此外，该上下文还存储了一个裸的 指针，这可能导致连接对象在工作队列中仍被排队时就被释放。 中的出队操

AI Predicted 5.5 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1218 · System Binary Proxy Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux e07a06b4eb417f5271d33ce2240e93c62d98b7b4< 37cfec41365c826d5496ef5d00c9e215eee53aa2 affected
e07a06b4eb417f5271d33ce2240e93c62d98b7b4< 9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27 affected
e07a06b4eb417f5271d33ce2240e93c62d98b7b4< a661de0ee29d0915c5e924edf91d2be2b4d35bae affected
e07a06b4eb417f5271d33ce2240e93c62d98b7b4< c1fe3c74a89a7749cba3caa0dd91236049c66116 affected
e07a06b4eb417f5271d33ce2240e93c62d98b7b4< 4d7b1c834d2775b73c65e4888e01f5af8b477fe9 affected
e07a06b4eb417f5271d33ce2240e93c62d98b7b4< 42de40abe25db9211107af8896d0fd741f10648d affected
6.1 affected
< 6.1 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-90255

Vulnerability Information
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Vulnerability Title
Bluetooth: hci_conn: fix the SCO setup context lifetime
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix the SCO setup context lifetime hci_setup_sync() queues a conn_handle_t with a NULL destroy callback, so the context is only freed if hci_enhanced_setup_sync() actually runs. An entry that is cancelled instead 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. The context also stores a bare hci_conn pointer, so the connection can be freed while the work is queued. The dequeue in hci_conn_del() does not cover it either, as it matches on entry->data == conn and entry->data is the wrapper here. Same problem as commit 2f5d635ad590 ("Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks"). Hold the connection and release both from a destroy callback. The submission failure path drops both, since hci_cmd_sync_submit() does not call the destroy callback when it fails to queue.
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 e07a06b4eb417f5271d33ce2240e93c62d98b7b4 ~ 37cfec41365c826d5496ef5d00c9e215eee53aa2 -
Linux Linux 6.1 -

II. Public POCs for CVE-2026-90255

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III. Intelligence Information for CVE-2026-90255

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Patches & Fixes for CVE-2026-90255 (3)

Other References for CVE-2026-90255 (3)

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-2026-90252 Bluetooth: MGMT: free the HCI 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-2026-90267 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

V. Comments for CVE-2026-90255

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