Linux Kernel Vulnerability in PowerPC IRQ Handling

CVE-2026-93259

What is CVE-2026-93259?

A vulnerability in the Linux kernel related to PowerPC architecture causes issues during interrupt handling due to incorrect inline assembly. Specifically, r2 is not properly marked as clobbered in the call_do_irq() and call_do_softirq() functions, which can lead to register corruption and result in kernel crashes. This oversight has been addressed by updating the clobber list to include r2 when CONFIG_PPC_KERNEL_PCREL mode is enabled, ensuring the stability and reliability of the kernel during IRQ processing.

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