CVE-2026-89800

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < a129b2b875c148aba233ace8447a0c36ca3bae07affected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < 196ce9e5e93202da097062be24e404984dbc5ac2affected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < 1101cbfe7f342e5eaaf7444965d4f1215abdac4caffected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < c60033c172420179b7bbb3d1f843f8dc90164dc5affected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < 38a62306c4266bcb3cd89e33c7111ee33096ebb3affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References