Bug 2516350 (CVE-2026-68479)

Summary:	CVE-2026-68479 kernel: Bluetooth: btrtl: validate firmware patch bounds
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
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 btrtl module. This vulnerability allows a local attacker to provide a specially crafted firmware patch during Bluetooth setup. This can cause an integer underflow, leading to an oversized read and write operation. Such an operation can result in memory corruption, potentially enabling a denial of service or arbitrary code execution.	Story Points:	---
Clone Of:		Environment:
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 06:07:53 UTC

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

Bluetooth: btrtl: validate firmware patch bounds

rtlbt_parse_firmware() copies patch_length - 4 bytes before appending the
firmware version. A malformed firmware patch shorter than the version field
can make this subtraction underflow and turn the copy into an oversized
read and write during Bluetooth setup.

The existing patch_offset + patch_length check can also wrap on 32-bit
architectures. Validate the patch length and range without arithmetic
overflow before allocating or copying the patch.

Comment 1 Keith Grant 2026-08-17 14:53:24 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081506-CVE-2026-68479-5ea9@gregkh/T