{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8e7b58c27b3c567316a51079b375b846f9223bba"
            },
            {
              "fixed": "a1dabe68fb53730bc0be60c5dbfd3f4c560084e7"
            },
            {
              "fixed": "d787d509bdf6c88c85e095247daf7456cb7fb772"
            },
            {
              "fixed": "7a1fb95de5404134f8758c1295ce88986bdf117c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "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-2026-89500.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Make cpu_buffer::free_page a buffer_data_read_page\n\nDiscarding a cached reader page after a concurrent ring buffer resize\nuses the new global subbuf_order for the free_pages() call. This\nmismatched order may crashes the kernel or leaks memory because the cached\npage was allocated under the old size.\n\nSave the actual free_page order alongside the page address to ensure we\nalways refer to the correct value and do not rely on the potentially\nstalled cpu_buffer-\u003esubbuf_order value. The simplest is to make\nfree_page a buffer_data_read_page which already covers exactly what we\nneed: a page address and a page order.",
  "id": "CVE-2026-89500",
  "modified": "2026-09-15T03:30:38.839880785Z",
  "published": "2026-09-11T19:43:49.392Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89500.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89500"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page"
}