{"id":"CVE-2026-89801","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE\n\nIn nouveau_uvmm_bind_job_submit()'s OP_UNMAP_SPARSE arm, op->reg is set\nfrom nouveau_uvma_region_…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE\n\nIn nouveau_uvmm_bind_job_submit()'s OP_UNMAP_SPARSE arm, op->reg is set\nfrom nouveau_uvma_region_…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 < ba42d8a1c2c7629c61914df11a7d63ac77449ffb","Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 < 88114e3a96582882e63b2f73aa7a5a9cf0d5073c","Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 < 24c25b182d17d1bdfde0088c96bdf6f93e8f46bc","Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 < 4083d24c2636fde7b18076115af52820d203bc57","Linux >= b88baab828713ce0b49b185444b2ee83bed373a8 < ccf930812f23b8259ef64fd3394d53b093e4651a","Linux 6.6"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:09.867","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89801","references":[{"url":"https://git.kernel.org/stable/c/24c25b182d17d1bdfde0088c96bdf6f93e8f46bc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4083d24c2636fde7b18076115af52820d203bc57","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/88114e3a96582882e63b2f73aa7a5a9cf0d5073c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ba42d8a1c2c7629c61914df11a7d63ac77449ffb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ccf930812f23b8259ef64fd3394d53b093e4651a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.008Z","epss":0.00159,"epssPercentile":0.05462,"slug":"CVE-2026-89801","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE\n\nIn nouveau_uvmm_bind_job_submit()'s OP_UNMAP_SPARSE arm, op->reg is set\nfrom nouveau_uvma_region_find(), which only looks the region up and takes\nno reference; a region's sole reference is its membership in\nuvmm->region_mt. Two failure paths leave op->reg set: the -ENOENT check\nwhen the region is busy, and the drm_gpuvm_sm_unmap_ops_create() failure.\nThe sibling nouveau_uvmm_sm_unmap_prepare() failure just below clears\nop->reg; these two do not.\n\nunwind_continue steps back one op, so the failing op is skipped by the\nunwind loop and its op->reg stays set. nouveau_uvmm_bind_job_cleanup()\nthen enters its if (op->reg) branch and calls nouveau_uvma_region_remove()\nand nouveau_uvma_region_put() on it, dropping the tree's sole reference\nand freeing a region this job never created. The comment above the\ncleanup loop documents the broken invariant: op->reg must be NULL on\nsubmit failure.\n\nThis frees a live region on an unrelated failure, reachable single-job\nwhen drm_gpuvm_sm_unmap_ops_create() returns -ENOMEM; if another job owns\nthe same region, its cleanup then removes and puts the freed region, a\nuse-after-free. Clear op->reg on both failure paths.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205243,"id":"CVE-2026-89801","ts":1789570705899,"field":"cvss","old":null,"new":"7.8"},{"seq":205242,"id":"CVE-2026-89801","ts":1789570705899,"field":"severity","old":"none","new":"high"}]}