---
id: CVE-2026-89800
title: |-
  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 defer…
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 defer…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 <
    a129b2b875c148aba233ace8447a0c36ca3bae07
  - >-
    Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 <
    196ce9e5e93202da097062be24e404984dbc5ac2
  - >-
    Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 <
    1101cbfe7f342e5eaaf7444965d4f1215abdac4c
  - >-
    Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 <
    c60033c172420179b7bbb3d1f843f8dc90164dc5
  - >-
    Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 <
    38a62306c4266bcb3cd89e33c7111ee33096ebb3
  - Linux 6.6
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:16:44.877'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89800'
references:
  - url: 'https://git.kernel.org/stable/c/1101cbfe7f342e5eaaf7444965d4f1215abdac4c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/196ce9e5e93202da097062be24e404984dbc5ac2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/38a62306c4266bcb3cd89e33c7111ee33096ebb3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a129b2b875c148aba233ace8447a0c36ca3bae07'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c60033c172420179b7bbb3d1f843f8dc90164dc5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.008Z'
epss: 0.002
epssPercentile: 0.08782
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.