{
  "cveId": "CVE-2026-93233",
  "url": "https://patchblox.com/security/cve/CVE-2026-93233",
  "summary": "CVE-2026-93233 is fixed in linux on 1 platform by DEBIAN-CVE-2026-93233 (version 7.2.6-1), released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  drm/nouveau/dmem: fix callocated underflow on la...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  drm/nouveau/dmem: fix callocated underflow on large folio split  nouveau_dmem_folio_free() drops chunk-\u003Ecallocated once per freed folio, while a large (compound) device-private folio is only counted once when it is allocated.  When such a folio is split, the mm core invokes -\u003Efolio_split() (nouveau_dmem_folio_split()) once for each new sub-folio, but the hook only fixes up the sub-folio metadata and leaves chunk-\u003Ecallocated unchanged.  Each resulting sub-folio is later freed separately, so after a split the single allocation (\u002B1) is met by N frees (-N), leaving chunk-\u003Ecallocated short by N-1.  On the first split/free cycle it underflows: WARN_ON(!chunk-\u003Ecallocated) fires, the unsigned counter wraps and never returns to zero, so the chunk can no longer be reclaimed (nouveau_dmem_fini() also warns on the leaked count).  Account for the new sub-folio in the split hook, under the same lock as nouveau_dmem_folio_free(), so the count stays balanced.",
  "published": "2026-09-24T16:17:18Z",
  "severity": "",
  "epss": 0.00155,
  "epssPercentile": 0.04709,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93233",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93233",
      "released": "2026-09-24T19:30:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}