CVE-2026-93260 (GCVE-0-2026-93260)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:51 – Updated: 2026-09-25 05:09
VLAI
Title
powerpc/xive: propagate IPI init errors to prevent use-after-free
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.
Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 243e25112d06b348f087a6f7aba4bbc288285bdd , < c554a8d376d5aea1b237ed6bef6f9fbfc550e67f (git)
Affected: 243e25112d06b348f087a6f7aba4bbc288285bdd , < 411a3c016e7a95f5fa105a0587e07d0647a77727 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "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": "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": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "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-rc1",
                  "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": "2026-09-25T05:09:53.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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": "2026-09-25T05:09:53.050Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-93260",
      "date": "2026-09-25",
      "epss": "0.00134",
      "percentile": "0.02376"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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": "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": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-93260",
        "lastModified": "2026-09-25T05:17:01.133",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.4,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-24T16:17:22.670",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/411a3c016e7a95f5fa105a0587e07d0647a77727"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c554a8d376d5aea1b237ed6bef6f9fbfc550e67f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-24T23:48:55Z",
      "cve": "CVE-2026-93260",
      "id": "CVE-2026-93260",
      "initial_release_date": "2026-09-24T23:48:55Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93260",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93260.json",
      "version": "2"
    }
  }
}



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