{
  "cveId": "CVE-2026-89801",
  "url": "https://patchblox.com/security/cve/CVE-2026-89801",
  "summary": "CVE-2026-89801 is fixed in 47 products on 1 platform, first by DEBIAN-CVE-2026-89801, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "drm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  drm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE  In nouveau_uvmm_bind_job_submit()\u0027s OP_UNMAP_SPARSE arm, op-\u003Ereg is set from nouveau_uvma_region_find(), which only looks the region up and takes no reference; a region\u0027s sole reference is its membership in uvmm-\u003Eregion_mt. Two failure paths leave op-\u003Ereg set: the -ENOENT check when the region is busy, and the drm_gpuvm_sm_unmap_ops_create() failure. The sibling nouveau_uvmm_sm_unmap_prepare() failure just below clears op-\u003Ereg; these two do not.  unwind_continue steps back one op, so the failing op is skipped by the unwind loop and its op-\u003Ereg stays set. nouveau_uvmm_bind_job_cleanup() then enters its if (op-\u003Ereg) branch and calls nouveau_uvma_region_remove() and nouveau_uvma_region_put() on it, dropping the tree\u0027s sole reference and freeing a region this job never created. The comment above the cleanup loop documents the broken invariant: op-\u003Ereg must be NULL on submit failure.  This frees a live region on an unrelated failure, reachable single-job when drm_gpuvm_sm_unmap_ops_create() returns -ENOMEM; if another job owns the same region, its cleanup then removes and puts the freed region, a use-after-free. Clear op-\u003Ereg on both failure paths.",
  "published": "2026-09-16T11:16:44Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00159,
  "epssPercentile": 0.05057,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89801",
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