{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a"
            },
            {
              "fixed": "a520e8cac54fb403f3800125b606f55fcad42cb9"
            },
            {
              "fixed": "d64a75369cd0f2ee79afcc9d9ca34a3890989379"
            },
            {
              "fixed": "b53435c079c78f89f70a62dd5a322cca4e292b34"
            },
            {
              "fixed": "78004e9a87f240df03e2f73120d291763c32e0a7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89489.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenrisc: fix arbitrary kernel memory access via or1k_atomic syscall\n\nsys_or1k_atomic() (syscall 244 in the \"or1k\" ABI) takes two user\npointers, v1 and v2, and swaps the words they point to in hand-written\nassembly.\n\n    l.lwz   r29,0(r4)\n    l.lwz   r27,0(r5)\n    l.sw    0(r4),r27\n    l.sw    0(r5),r29\n\nThe pointers are not checked with access_ok(). The four memory\naccesses also have no exception table entries.\n\nA caller passes a kernel address as either pointer, and the syscall\nreads from and writes to it directly.\n\nThis gives an unprivileged process a kernel read/write primitive. It\noverwrites kernel data such as the sys_call_table, gaining code\nexecution in kernel context.\n\nCheck both pointers before entering the critical section. Add fixups\nfor the four memory accesses so faults on valid but unmapped user\naddresses return -EFAULT.\n\n[shorne@gmail.com: fix comment style]",
  "id": "CVE-2026-89489",
  "modified": "2026-09-13T03:30:37.508238972Z",
  "published": "2026-09-11T19:43:42.164Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89489.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89489"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "openrisc: fix arbitrary kernel memory access via or1k_atomic syscall"
}