CVE-2026-93260 (GCVE-0-2026-93260)
Vulnerability from cvelistv5
Published
2026-09-24 15:51
Modified
2026-10-30 12:36
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 243e25112d06b348f087a6f7aba4bbc288285bdd Version: 243e25112d06b348f087a6f7aba4bbc288285bdd Version: 243e25112d06b348f087a6f7aba4bbc288285bdd Version: 243e25112d06b348f087a6f7aba4bbc288285bdd Version: 243e25112d06b348f087a6f7aba4bbc288285bdd Version: 243e25112d06b348f087a6f7aba4bbc288285bdd |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/powerpc/platforms/powernv/smp.c",
"arch/powerpc/platforms/pseries/smp.c",
"arch/powerpc/sysdev/xive/common.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "89e1caa5b0aafe23e9938d9a311e9d41baee583e",
"status": "affected",
"version": "243e25112d06b348f087a6f7aba4bbc288285bdd",
"versionType": "git"
},
{
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"status": "affected",
"version": "243e25112d06b348f087a6f7aba4bbc288285bdd",
"versionType": "git"
},
{
"lessThan": "2ea6238343691309e68308131c7e80c3ae05afea",
"status": "affected",
"version": "243e25112d06b348f087a6f7aba4bbc288285bdd",
"versionType": "git"
},
{
"lessThan": "5c9ab0c9cede9f149733d330e2d7d45341b71359",
"status": "affected",
"version": "243e25112d06b348f087a6f7aba4bbc288285bdd",
"versionType": "git"
},
{
"lessThan": "c554a8d376d5aea1b237ed6bef6f9fbfc550e67f",
"status": "affected",
"version": "243e25112d06b348f087a6f7aba4bbc288285bdd",
"versionType": "git"
},
{
"lessThan": "411a3c016e7a95f5fa105a0587e07d0647a77727",
"status": "affected",
"version": "243e25112d06b348f087a6f7aba4bbc288285bdd",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/powerpc/platforms/powernv/smp.c",
"arch/powerpc/platforms/pseries/smp.c",
"arch/powerpc/sysdev/xive/common.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"lessThan": "4.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.114",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.57",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "4.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": {
"baseScore": 7.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The UAF is in xive_setup_cpu_ipi() after xive_init_ipis() kfree\u0027s xive_ipis, reached only from kernel_init_freeable()-\u003esmp_prepare_cpus()-\u003epnv_smp_probe()/pSeries_smp_probe()-\u003exive_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()\u0027s 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-\u003eirq and xid-\u003ename 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(\u0026xid-\u003estarted) on the freed descriptor and request_irq(xid-\u003eirq, 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\u0027d 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:36:35.383Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/89e1caa5b0aafe23e9938d9a311e9d41baee583e"
},
{
"url": "https://git.kernel.org/stable/c/e36b1c2eafcaaddefa70d55e6fda74cf6cda38af"
},
{
"url": "https://git.kernel.org/stable/c/2ea6238343691309e68308131c7e80c3ae05afea"
},
{
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-93260",
"datePublished": "2026-09-24T15:51:46.703Z",
"dateReserved": "2026-09-17T16:02:15.097Z",
"dateUpdated": "2026-10-30T12:36:35.383Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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