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

CVE-2026-93260 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-93260, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-93260
- Priority: High
- CVSS: 7.4 (Moderate)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-93260](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93260.md) | Sep 24, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-93260](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93260.md) | Sep 24, 2026 |

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