CVE-2026-89801 (GCVE-0-2026-89801)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:52
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE In nouveau_uvmm_bind_job_submit()'s OP_UNMAP_SPARSE arm, op->reg is set from nouveau_uvma_region_find(), which only looks the region up and takes no reference; a region's sole reference is its membership in uvmm->region_mt. Two failure paths leave op->reg set: the -ENOENT check when the region is busy, and the drm_gpuvm_sm_unmap_ops_create() failure. The sibling nouveau_uvmm_sm_unmap_prepare() failure just below clears op->reg; these two do not. unwind_continue steps back one op, so the failing op is skipped by the unwind loop and its op->reg stays set. nouveau_uvmm_bind_job_cleanup() then enters its if (op->reg) branch and calls nouveau_uvma_region_remove() and nouveau_uvma_region_put() on it, dropping the tree's sole reference and freeing a region this job never created. The comment above the cleanup loop documents the broken invariant: op->reg must be NULL on submit failure. This frees a live region on an unrelated failure, reachable single-job when drm_gpuvm_sm_unmap_ops_create() returns -ENOMEM; if another job owns the same region, its cleanup then removes and puts the freed region, a use-after-free. Clear op->reg on both failure paths.
References
Impacted products
Vendor Product Version
Linux Linux Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "6.6",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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()\u0027s OP_UNMAP_SPARSE arm, op-\u003ereg is set\nfrom nouveau_uvma_region_find(), which only looks the region up and takes\nno reference; a region\u0027s sole reference is its membership in\nuvmm-\u003eregion_mt. Two failure paths leave op-\u003ereg 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-\u003ereg; these two do not.\n\nunwind_continue steps back one op, so the failing op is skipped by the\nunwind loop and its op-\u003ereg stays set. nouveau_uvmm_bind_job_cleanup()\nthen enters its if (op-\u003ereg) branch and calls nouveau_uvma_region_remove()\nand nouveau_uvma_region_put() on it, dropping the tree\u0027s sole reference\nand freeing a region this job never created. The comment above the\ncleanup loop documents the broken invariant: op-\u003ereg 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-\u003ereg on both failure paths."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached through DRM_IOCTL_NOUVEAU_VM_BIND on a nouveau render node (/dev/dri/renderD*): nouveau_uvmm_ioctl_vm_bind \u2192 nouveau_job_submit \u2192 nouveau_uvmm_bind_job_submit. This is a local ioctl path, not a network, adjacent-radio, or physical-bus interface.\nAC:L - An attacker can MAP_SPARSE a region, submit an async OP_UNMAP_SPARSE that dirties it while holding op-\u003ereg, then a second OP_UNMAP_SPARSE on the same range (or two unmaps in one ioctl). The failing path leaves op-\u003ereg set and cleanup frees the live region. The attacker drives both jobs, so no condition is outside their control.\nPR:L - NOUVEAU_VM_INIT and NOUVEAU_VM_BIND are DRM_RENDER_ALLOW with no DRM_ROOT_ONLY or capability checks. Any unprivileged local user who can open the nouveau render node (typical render/video group) can trigger this without init-namespace root.\nUI:N - The attacker opens their own DRM client and issues VM_INIT/VM_BIND ioctls on that fd; no separate victim action such as mounting a filesystem or opening an attacker-controlled file is required.\nS:U - The use-after-free corrupts kernel heap state (struct nouveau_uvma_region) inside the host nouveau driver. Impact stays in the same kernel authority; this is not a VM escape or IOMMU/DMA isolation bypass.\nC:H - Cleanup of a failed OP_UNMAP_SPARSE drops the maple-tree\u0027s sole reference and kfree()s a live nouveau_uvma_region another job still holds in op-\u003ereg. That use-after-free of a kernel object enables disclosure of reused slab contents, so confidentiality is High.\nI:H - The owning job\u0027s later cleanup calls sparse-unref, mas_erase, complete_all, and kref_put on the already-freed region. Heap spraying can reuse that object to corrupt kernel pointers and hijack control flow, so integrity is High.\nA:H - Dereferencing the freed nouveau_uvma_region in nouveau_uvmm_bind_job_cleanup, maple-tree remove, or a later bind causes a kernel oops/panic; the attacker can repeat the sequence to crash or hang the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:55.925Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ba42d8a1c2c7629c61914df11a7d63ac77449ffb"
        },
        {
          "url": "https://git.kernel.org/stable/c/88114e3a96582882e63b2f73aa7a5a9cf0d5073c"
        },
        {
          "url": "https://git.kernel.org/stable/c/24c25b182d17d1bdfde0088c96bdf6f93e8f46bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4083d24c2636fde7b18076115af52820d203bc57"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccf930812f23b8259ef64fd3394d53b093e4651a"
        }
      ],
      "title": "drm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89801",
    "datePublished": "2026-09-16T10:30:34.458Z",
    "dateReserved": "2026-09-11T19:38:34.767Z",
    "dateUpdated": "2026-10-19T08:52:55.925Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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