{
  "cveId": "CVE-2026-80718",
  "url": "https://patchblox.com/security/cve/CVE-2026-80718",
  "summary": "CVE-2026-80718 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-80718, released August 29, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()  In pcpu_create_chunk(), nr_pages is the total contiguous backing allocation, i.e., nr_units * pcpu_unit_pages, but pcpu_chunk_populated() uses it to set chunk-\u003Epopulated, whose size is pcpu_unit_pages, bitmap.  Since bit N in chunk-\u003Epopulated means page offset N inside every unit is backed.  When nr_units \u003E 1, the function writes beyond chunk-\u003Epopulated.  Fix it by using chunk-\u003Enr_pages.  It also fixes the global pcpu_nr_empty_pop_pages accounting, since pcpu_balance_free() only iterates up to chunk-\u003Enr_pages.  Commit a63d4ac4ab609 (\u0022percpu: make percpu-km set chunk-\u003Epopulated bitmap properly\u0022) introduced the bitmap overflow issue.  Later, commit b539b87fed37f (\u0022percpu: implmeent pcpu_nr_empty_pop_pages and chunk-\u003Enr_populated\u0022) added pcpu_nr_empty_pop_pages and caused the accounting issue.",
  "published": "2026-08-28T08:16:57Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00176,
  "epssPercentile": 0.07116,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80718",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.187-1",
      "fix": "DEBIAN-CVE-2026-80718",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80718",
      "released": "2026-08-29T00:46:20Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.105-1",
      "fix": "DEBIAN-CVE-2026-80718",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80718",
      "released": "2026-08-29T00:46:20Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.8-1",
      "fix": "DEBIAN-CVE-2026-80718",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80718",
      "released": "2026-08-29T00:46:20Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.107-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-80718",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80718",
      "released": "2026-08-29T00:46:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}