CVE-2026-80582 (GCVE-0-2026-80582)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:02
VLAI
Title
drm/shmem_helper: Check VMA boundaries for PMD mappings
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/shmem_helper: Check VMA boundaries for PMD mappings In the ->huge_fault handler do not install a PMD huge page mapping if the huge page exceeds the boundaries of the VMA. All other ->huge_fault handlers have similar checks and the resulting mapping will trigger a VM_BUG_ON_VMA() if it ever reaches copy_pmd_range().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fc3bbf34e643faa8678aabdc3810c60109f3435a , < 12803e89a1e593fd1e784dfe7453f5e392ccaff2 (git)
Affected: fc3bbf34e643faa8678aabdc3810c60109f3435a , < 617bbd08714857c1613d7c550d43a9092ec0fb97 (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_gem_shmem_helper.c"
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      "metrics": [
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            "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": [
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              "lang": "en",
              "value": "AV:L - Reachable via local mmap/page-fault on DRM GEM shmem buffers (drm_gem_mmap -\u003e drm_gem_shmem_any_fault -\u003e try_insert_pfn PMD path), used by virtio-gpu, panfrost, lima, v3d, panthor, and other GPU/accelerator drivers on phones, VMs, and desktops.\nAC:L - An attacker controls GEM buffer size, mmap length, fault addresses, and follow-on fork/mprotect; no race or rare layout is required beyond creating a non-PMD-aligned mapping near a VMA end so a 2MB PMD install overruns the VMA.\nPR:L - Only standard local GPU access is needed (open /dev/dri/renderD* or card*, DRM GEM create/mmap ioctls); no CAP_SYS_ADMIN or init-namespace root, matching unprivileged desktop render-group users, Android GPU apps, and cloud/VM GPU workloads.\nUI:N - Exploitation is fully attacker-driven through their own DRM client (create buffer, mmap, touch pages, fork); no separate victim action such as opening a file or mounting a filesystem is required.\nS:U - Impact stays within the kernel/GPU process security boundary (local memory corruption and kernel panic); it does not cross VM/host, IOMMU, or sandbox authority boundaries.\nC:H - Without the VMA boundary check, a 2MB PMD PFNMAP can cover virtual/physical pages beyond the GEM object and VMA, creating out-of-bounds read primitives from adjacent mapped memory before copy_pmd_range() trips VM_BUG_ON_VMA().\nI:H - The same oversized PMD mapping installs writable PFNMAP entries beyond the allocated buffer, enabling out-of-bounds writes and corrupt page tables exploitable for control-flow or data tampering, not merely a clean fault.\nA:H - The invalid PMD eventually hits VM_BUG_ON_VMA() in copy_pmd_range() or __split_huge_pmd() (e.g., fork of the mapping), producing a kernel BUG/oops and panic as demonstrated in related drm/shmem_helper THP testing."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:02:02.758Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/12803e89a1e593fd1e784dfe7453f5e392ccaff2"
        },
        {
          "url": "https://git.kernel.org/stable/c/617bbd08714857c1613d7c550d43a9092ec0fb97"
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      "title": "drm/shmem_helper: Check VMA boundaries for PMD mappings",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80582",
    "datePublished": "2026-08-26T14:37:39.113Z",
    "dateReserved": "2026-08-26T14:34:25.769Z",
    "dateUpdated": "2026-08-27T05:02:02.758Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80582",
      "date": "2026-09-01",
      "epss": "0.00112",
      "percentile": "0.01504"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T10:44:04+00:00",
      "cve": "CVE-2026-80582",
      "id": "CVE-2026-80582",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/shmem_helper: Check VMA boundaries for PMD mappings",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80582.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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