CVE-2026-43372 net: dsa: microchip: Fix error path in PTP IRQ setup

What is CVE-2026-43372?

CVE-2026-43372 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 May 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:

net: dsa: microchip: Fix error path in PTP IRQ setup

If request_threaded_irq() fails during the PTP message IRQ setup, the newly created IRQ mapping is never disposed. Indeed, the ksz_ptp_irq_setup()'s error path only frees the mappings that were successfully set up.

Dispose the newly created mapping if the associated request_threaded_irq() fails at setup.

Which versions are affected by CVE-2026-43372?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43372?

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-2026-43372 being exploited?

There is no known exploitation of CVE-2026-43372 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-2026-43372, DEBIAN-CVE-2026-43372, GHSA-qqh8-qfc3-4qg9, ROOT-OS-UBUNTU-2404-CVE-2026-43372, UBUNTU-CVE-2026-43372.