CVE-2026-89800 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20507109
- published5 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89800 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89800
- 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