drm/nouveau/uvmm: clear the dirty flag when unwinding an OP_UNMAP_SPARSE

{
  "id": "3841409df3e2f8ef2c7fd9b455effe09433c85e88768b8b626d9c0ab4a024bcc",
  "url": "https://osv.dev/vulnerability/CVE-2026-89800",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/nouveau/uvmm: clear the dirty flag when unwinding an OP_UNMAP_SPARSE",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/uvmm: clear the dirty flag when unwinding an OP_UNMAP_SPARSE A successful OP_UNMAP_SPARSE marks its region dirty with nouveau_uvma_region_dirty() and defers the teardown to nouveau_uvmm_bind_job_cleanup(); it does not remove the region from uvmm->region_mt. If a later op in the job fails, the unwind path never clears reg->dirty (set in one place, cleared nowhere) and sets op->reg = NULL, so cleanup skips the teardown. The region is left in the tree with dirty set and its completion never signalled. Later binds over that range then fail permanently -- -ENOENT or -EINVAL from the dirty checks, or an unkillable wait_for_completion() in bind_validate_region() -- for the lifetime of the uvmm. Clear reg->dirty when the unwind reverts the sparse unmap, restoring the region to the state it was found in.",
    "evidence": "osv:CVE-2026-89800",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89800",
      "aliases": [
        "CVE-2026-89800"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b88baab828713ce0b49b185444b2ee83bed373a8"
                },
                {
                  "fixed": "a129b2b875c148aba233ace8447a0c36ca3bae07"
                },
                {
                  "fixed": "196ce9e5e93202da097062be24e404984dbc5ac2"
                },
                {
                  "fixed": "1101cbfe7f342e5eaaf7444965d4f1215abdac4c"
                },
                {
                  "fixed": "c60033c172420179b7bbb3d1f843f8dc90164dc5"
                },
                {
                  "fixed": "38a62306c4266bcb3cd89e33c7111ee33096ebb3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89800.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.6.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.51"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89800.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.563463139Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1101cbfe7f342e5eaaf7444965d4f1215abdac4c",
        "https://git.kernel.org/stable/c/196ce9e5e93202da097062be24e404984dbc5ac2",
        "https://git.kernel.org/stable/c/38a62306c4266bcb3cd89e33c7111ee33096ebb3",
        "https://git.kernel.org/stable/c/a129b2b875c148aba233ace8447a0c36ca3bae07",
        "https://git.kernel.org/stable/c/c60033c172420179b7bbb3d1f843f8dc90164dc5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89800.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89800",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89800.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89800",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503926,
  "published_at": "2026-09-16T10:30:33.097+00:00"
}