Bug 2536598 (CVE-2026-90252)

Summary: CVE-2026-90252 kernel: Bluetooth: MGMT: free the HCI command when it is cancelled
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Bluetooth Management (MGMT) component of the Linux kernel. When a Host Controller Interface (HCI) command is cancelled, the associated memory is not properly freed, leading to a memory leak. This issue can also prevent the management socket from being released, potentially leading to resource exhaustion and a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-17 18:39:28 UTC 
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.
Comment 1 gkamathe 2026-09-23 19:46:33 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90252.mbox