Bug 2464464 (CVE-2026-43018)

Summary:	CVE-2026-43018 kernel: Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, 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 Linux kernel's Bluetooth component. This Use-After-Free (UAF) vulnerability arises from insufficient locking during `hci_conn` lookup and access within the `hci_le_remote_conn_param_req_evt` function. An attacker could potentially exploit this to cause a system crash or execute arbitrary code.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-01 15:08:17 UTC

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt

hci_conn lookup and field access must be covered by hdev lock in
hci_le_remote_conn_param_req_evt, otherwise it's possible it is freed
concurrently.

Extend the hci_dev_lock critical section to cover all conn usage.

Comment 1 Keith Grant 2026-05-01 16:40:33 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050157-CVE-2026-43018-b74a@gregkh/T