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CVE-2026-93260: powerpc/xive: propagate IPI init errors to prevent use-after-free

• Severity: high (CVSS 7.4 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: 2026-09-24 · updated 2026-10-30

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.

Affected products

• Linux: 4.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2ea6238343691309e68308131c7e80c3ae05afea
• https://git.kernel.org/stable/c/411a3c016e7a95f5fa105a0587e07d0647a77727
• https://git.kernel.org/stable/c/5c9ab0c9cede9f149733d330e2d7d45341b71359
• https://git.kernel.org/stable/c/89e1caa5b0aafe23e9938d9a311e9d41baee583e
• https://git.kernel.org/stable/c/c554a8d376d5aea1b237ed6bef6f9fbfc550e67f
• https://git.kernel.org/stable/c/e36b1c2eafcaaddefa70d55e6fda74cf6cda38af

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