{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93260", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.097Z", "datePublished": "2026-09-24T15:51:46.703Z", "dateUpdated": "2026-10-19T09:08:13.542Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:08:13.542Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/xive: propagate IPI init errors to prevent use-after-free\n\nWhen xive_init_ipis() fails (e.g. irq_domain_alloc_irqs() fails),\nthe error path frees the global xive_ipis array. However,\nxive_smp_probe() previously ignored this failure and proceeded to\ncall xive_setup_cpu_ipi(), which dereferences the already-freed\nxive_ipis pointer -- a use-after-free.\n\nNow that xive_smp_probe() returns int (previous patch), propagate\nthe error from xive_init_ipis() and xive_setup_cpu_ipi() through\nxive_smp_probe(). Check the return value in both pnv_smp_probe()\nand pSeries_smp_probe() so that IPI setup is aborted cleanly on\nfailure, avoiding the use-after-free." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is in xive_setup_cpu_ipi() after xive_init_ipis() kfree's xive_ipis, reached only from kernel_init_freeable()->smp_prepare_cpus()->pnv_smp_probe()/pSeries_smp_probe()->xive_smp_probe(); no protocol message or received packet supplies the trigger.\nAC:H - The free-then-use fires only when irq_domain_alloc_irqs() fails in xive_init_ipis()'s for_each_node loop (irq_desc ENOMEM/ENOSPC), after which kfree(xive_ipis) runs; that allocator failure during early SMP probe cannot be induced on demand.\nPR:N - xive_smp_probe() runs as swapper/0 from smp_prepare_cpus() in kernel_init_freeable() before userspace, with no capable() or credential check on pnv_smp_probe() or pSeries_smp_probe().\nUI:N - SMP IPI probe is invoked unconditionally by smp_prepare_cpus() during ordinary boot once xive_core_init() has set __xive_enabled; no victim mount, file open, or other interactive step is required.\nS:U - The dangling xive_ipis dereference corrupts heap in the same Linux instance that runs XIVE (PowerNV host or pSeries guest); it is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - After kfree(xive_ipis) without NULLing, xive_ipi_cpu_to_irq() and xive_request_ipi() read xid->irq and xid->name from the freed xive_ipi_desc array; that heap use-after-free can disclose whatever reclaimed the slab.\nI:H - xive_request_ipi() then atomic_inc_return(&xid->started) on the freed descriptor and request_irq(xid->irq, xive_muxed_ipi_action) using the UAF-read virq, a write-after-free of the xive_ipi_desc slab that can corrupt a reused object and install a handler on the wrong irq.\nA:H - Dereferencing the kfree'd xive_ipis pointer in xive_setup_cpu_ipi() during xive_smp_probe() oopses or panics the kernel while bringing up SMP, so the machine fails to boot." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/powerpc/platforms/powernv/smp.c", "arch/powerpc/platforms/pseries/smp.c", "arch/powerpc/sysdev/xive/common.c" ], "versions": [ { "version": "243e25112d06b348f087a6f7aba4bbc288285bdd", "lessThan": "5c9ab0c9cede9f149733d330e2d7d45341b71359", "status": "affected", "versionType": "git" }, { "version": "243e25112d06b348f087a6f7aba4bbc288285bdd", "lessThan": "c554a8d376d5aea1b237ed6bef6f9fbfc550e67f", "status": "affected", "versionType": "git" }, { "version": "243e25112d06b348f087a6f7aba4bbc288285bdd", "lessThan": "411a3c016e7a95f5fa105a0587e07d0647a77727", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/powerpc/platforms/powernv/smp.c", "arch/powerpc/platforms/pseries/smp.c", "arch/powerpc/sysdev/xive/common.c" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5c9ab0c9cede9f149733d330e2d7d45341b71359" }, { "url": "https://git.kernel.org/stable/c/c554a8d376d5aea1b237ed6bef6f9fbfc550e67f" }, { "url": "https://git.kernel.org/stable/c/411a3c016e7a95f5fa105a0587e07d0647a77727" } ], "title": "powerpc/xive: propagate IPI init errors to prevent use-after-free", "x_generator": { "engine": "bippy-1.2.0" } } } }