{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0d3ff067331ef84e7e7f49537d768881042ed5ba"
            },
            {
              "fixed": "11ef1c2a5dbe0bd8c1345f59bab7331d352f02cf"
            },
            {
              "fixed": "df45337587db21c502fe5251d3bcc7887428f4fb"
            },
            {
              "fixed": "4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0dea"
            },
            {
              "fixed": "761eda315a6e1fda3e8e2185b28430771fb1ac29"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89963.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kexec_file: Fix null-ptr-def in extra size calculation\n\nA static Sashiko AI review identified a potential NULL pointer\ndereference in kexec_extra_fdt_size_ppc64().\n\nOn platforms without any reserved memory regions,\nget_reserved_memory_ranges() can return 0 while leaving 'rmem'\nunallocated as NULL. Passing it directly leads to a kernel panic when\nevaluating 'rmem-\u003enr_ranges'.\n\nAdd a NULL check for 'rmem' to prevent this crash.",
  "id": "CVE-2026-89963",
  "modified": "2026-09-18T03:30:26.821427764Z",
  "published": "2026-09-16T10:32:45.336Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11ef1c2a5dbe0bd8c1345f59bab7331d352f02cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0dea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/761eda315a6e1fda3e8e2185b28430771fb1ac29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df45337587db21c502fe5251d3bcc7887428f4fb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89963.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89963"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "powerpc/kexec_file: Fix null-ptr-def in extra size calculation"
}