{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  powerpc/kexec_file: Fix null-ptr-def in extra size calculation  A static Sashiko AI review identified a potential NULL pointer dereference in kexec_extra_fdt_size_ppc64().  On platforms without any reserved memory regions, get_reserved_memory_ranges() can return 0 while leaving 'rmem' unallocated as NULL. Passing it directly leads to a kernel panic when evaluating 'rmem-\u003enr_ranges'.  Add a NULL check for 'rmem' to prevent this crash.",
  "id": "DEBIAN-CVE-2026-89963",
  "modified": "2026-09-17T04:47:33.224472948Z",
  "published": "2026-09-16T11:17:06.807Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89963"
    }
  ],
  "upstream": [
    "CVE-2026-89963"
  ]
}