CVE-2026-63862 PCI: mediatek-gen3: Prevent leaking IRQ domains when IRQ not found

What is CVE-2026-63862?

CVE-2026-63862 is a medium-severity denial of service vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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".

Which versions are affected by CVE-2026-63862?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-63862?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-63862 being exploited?

There is no known exploitation of CVE-2026-63862 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-63862, DEBIAN-CVE-2026-63862, GHSA-x3mw-3vxw-g4f9, ROOT-OS-UBUNTU-2204-CVE-2026-63862, UBUNTU-CVE-2026-63862.