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drm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89801

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89801

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
        "lessThan": "ba42d8a1c2c7629c61914df11a7d63ac77449ffb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
        "lessThan": "88114e3a96582882e63b2f73aa7a5a9cf0d5073c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
        "lessThan": "24c25b182d17d1bdfde0088c96bdf6f93e8f46bc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
        "lessThan": "4083d24c2636fde7b18076115af52820d203bc57",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
        "lessThan": "ccf930812f23b8259ef64fd3394d53b093e4651a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89801

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36268 · Revision 1
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