GHSA-G7QR-GGG3-47G8
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30In 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.
{
"affected": [],
"aliases": [
"CVE-2026-89800"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:16:44Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: clear the dirty flag when unwinding an OP_UNMAP_SPARSE\n\nA successful OP_UNMAP_SPARSE marks its region dirty with\nnouveau_uvma_region_dirty() and defers the teardown to\nnouveau_uvmm_bind_job_cleanup(); it does not remove the region from\nuvmm-\u003eregion_mt.\n\nIf a later op in the job fails, the unwind path never clears reg-\u003edirty\n(set in one place, cleared nowhere) and sets op-\u003ereg = NULL, so cleanup\nskips the teardown. The region is left in the tree with dirty set and its\ncompletion never signalled. Later binds over that range then fail\npermanently -- -ENOENT or -EINVAL from the dirty checks, or an unkillable\nwait_for_completion() in bind_validate_region() -- for the lifetime of\nthe uvmm.\n\nClear reg-\u003edirty when the unwind reverts the sparse unmap, restoring the\nregion to the state it was found in.",
"id": "GHSA-g7qr-ggg3-47g8",
"modified": "2026-09-16T12:30:36Z",
"published": "2026-09-16T12:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89800"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1101cbfe7f342e5eaaf7444965d4f1215abdac4c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/196ce9e5e93202da097062be24e404984dbc5ac2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/38a62306c4266bcb3cd89e33c7111ee33096ebb3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a129b2b875c148aba233ace8447a0c36ca3bae07"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c60033c172420179b7bbb3d1f843f8dc90164dc5"
}
],
"schema_version": "1.4.0",
"severity": []
}
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