CVE-2026-93260
Description
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.
How to fix
- Linux Linux89e1caa5b0aafe23e9938d9a311e9d41baee583e, e36b1c2eafcaaddefa70d55e6fda74cf6cda38af, 2ea6238343691309e68308131c7e80c3ae05afea, 5c9ab0c9cede9f149733d330e2d7d45341b71359, c554a8d376d5aea1b237ed6bef6f9fbfc550e67f, 411a3c016e7a95f5fa105a0587e07d0647a77727 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 243e25112d06b348f087a6f7aba4bbc288285bdd ≤ v < 89e1caa5b0aafe23e9938d9a311e9d41baee583e, 243e25112d06b348f087a6f7aba4bbc288285bdd ≤ v < e36b1c2eafcaaddefa70d55e6fda74cf6cda38af, 243e25112d06b348f087a6f7aba4bbc288285bdd ≤ v < 2ea6238343691309e68308131c7e80c3ae05afea, 243e25112d06b348f087a6f7aba4bbc288285bdd ≤ v < 5c9ab0c9cede9f149733d330e2d7d45341b71359, 243e25112d06b348f087a6f7aba4bbc288285bdd ≤ v < c554a8d376d5aea1b237ed6bef6f9fbfc550e67f, 243e25112d06b348f087a6f7aba4bbc288285bdd ≤ v < 411a3c016e7a95f5fa105a0587e07d0647a77727, 4.12 | 89e1caa5b0aafe23e9938d9a311e9d41baee583e, e36b1c2eafcaaddefa70d55e6fda74cf6cda38af, 2ea6238343691309e68308131c7e80c3ae05afea, 5c9ab0c9cede9f149733d330e2d7d45341b71359, c554a8d376d5aea1b237ed6bef6f9fbfc550e67f, 411a3c016e7a95f5fa105a0587e07d0647a77727 |
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