CVE-2026-93260

In the Linux kernel, the following vulnerability has been resolved:

powerpc/xive: propagate IPI init errors to prevent use-after-free

When xive_init_ipis() fails (e.g. irq_domain_alloc_irqs() fails),

the error path frees the global xive_ipis array. However,

xive_smp_probe() previously ignored this failure and proceeded to

call xive_setup_cpu_ipi(), which dereferences the already-freed

xive_ipis pointer -- a use-after-free.

Now that xive_smp_probe() returns int (previous patch), propagate

the error from xive_init_ipis() and xive_setup_cpu_ipi() through

xive_smp_probe(). Check the return value in both pnv_smp_probe()

and pSeries_smp_probe() so that IPI setup is aborted cleanly on

failure, avoiding the use-after-free.