Bug 2502276 (CVE-2026-63862)

Summary: CVE-2026-63862 kernel: PCI: mediatek-gen3: Prevent leaking IRQ domains when IRQ not found
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's MediaTek PCIe (Peripheral Component Interconnect Express) generation 3 driver. This vulnerability occurs because interrupt request (IRQ) domains are allocated before verifying the controller's IRQ. If the IRQ fetch fails, the allocated domains are not properly released, leading to a resource leak. An attacker could potentially exploit this to cause resource exhaustion, which may result in system instability or a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-07-19 15:01:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

PCI: mediatek-gen3: Prevent leaking IRQ domains when IRQ not found

In mtk_pcie_setup_irq(), the IRQ domains are allocated before the
controller's IRQ is fetched. If the latter fails, the function
directly returns an error, without cleaning up the allocated domains.

Hence, reverse the order so that the IRQ domains are allocated after the
controller's IRQ is found.

This was flagged by Sashiko during a review of "[PATCH v6 0/7] PCI:
mediatek-gen3: add power control support".
Comment 1 Keith Grant 2026-07-21 18:56:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071934-CVE-2026-63862-533e@gregkh/T