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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17

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.

Affected products

• Linux kernel: from 6.6.119 before 6.6.130; from 6.12.61 before 6.12.78; from 6.17.11 before 6.18; from 6.18.1 before 6.18.19; from 6.19 before 6.19.9; 6.18, 7.0-rc1, 7.0-rc2, 7.0-rc3 — fixed in 6.12.78, 6.18, 6.18.19, 6.19.9, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.12.78, 6.18, 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3704ac6a0d9a78f66a187515a8ca3faedaf01cc5
• https://git.kernel.org/stable/c/6c58a9fdb0d0e1011aa02455d26d6ebea251979b
• https://git.kernel.org/stable/c/99c8c16a4aad0b37293cae213e15957c573cf79b
• https://git.kernel.org/stable/c/c2d1d41e0e8ec447d40a5752844fc5fb0b23db27
• https://git.kernel.org/stable/c/e80fef36c676c947072dabeb5803ae59d92ba493

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