CVE-2026-43497 (GCVE-0-2026-43497)

Vulnerability from cvelistv5 – Published: 2026-05-21 12:12 – Updated: 2026-08-05 12:28
VLAI
Title
fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free dlfb_ops_mmap() uses remap_pfn_range() to map vmalloc framebuffer pages to userspace but sets no vm_ops on the VMA. This means the kernel cannot track active mmaps. When dlfb_realloc_framebuffer() replaces the backing buffer via FBIOPUT_VSCREENINFO, existing mmap PTEs are not invalidated. On USB disconnect, dlfb_ops_destroy() calls vfree() on the old pages while userspace PTEs still reference them, resulting in a use-after-free: the process retains read/write access to freed kernel pages. Add vm_operations_struct with open/close callbacks that maintain an atomic mmap_count on struct dlfb_data. In dlfb_realloc_framebuffer(), check mmap_count and return -EBUSY if the buffer is currently mapped, preventing buffer replacement while userspace holds stale PTEs. Tested with PoC using dummy_hcd + raw_gadget USB device emulation.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < 60f711cfd580f86fea8284146ac133804e728f9a (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < 5931f5651ee32bd41b3323256b31fcc8e71336ed (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < e3d9865dacd7435b8465848428210d0f0c673311 (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < 4f312c30f0368e8d2a76aa650dff73f23490b5e7 (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < 18dd358de72d57993422cbb5dfb29ccd74efe192 (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < da9b065cedfd3b574f229d5be594e6aa47a27ae6 (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < a2c53a3822ee26e8d758071815b9ed3bf6669fc1 (git)
Affected: 7433914efd584b22bb49d3e1eee001f5d0525ecd , < 8de779dc40d35d39fa07387b6f921eb11df0f511 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free\n\ndlfb_ops_mmap() uses remap_pfn_range() to map vmalloc framebuffer pages\nto userspace but sets no vm_ops on the VMA. This means the kernel cannot\ntrack active mmaps. When dlfb_realloc_framebuffer() replaces the backing\nbuffer via FBIOPUT_VSCREENINFO, existing mmap PTEs are not invalidated.\nOn USB disconnect, dlfb_ops_destroy() calls vfree() on the old pages\nwhile userspace PTEs still reference them, resulting in a use-after-free:\nthe process retains read/write access to freed kernel pages.\n\nAdd vm_operations_struct with open/close callbacks that maintain an\natomic mmap_count on struct dlfb_data. In dlfb_realloc_framebuffer(),\ncheck mmap_count and return -EBUSY if the buffer is currently mapped,\npreventing buffer replacement while userspace holds stale PTEs.\n\nTested with PoC using dummy_hcd + raw_gadget USB device emulation."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: udlfb: a\u00f1adir vm_ops a dlfb_ops_mmap para prevenir el uso despu\u00e9s de liberaci\u00f3n\n\ndlfb_ops_mmap() utiliza remap_pfn_range() para mapear p\u00e1ginas de framebuffer de vmalloc al espacio de usuario, pero no establece vm_ops en el VMA. Esto significa que el kernel no puede rastrear mmaps activos. Cuando dlfb_realloc_framebuffer() reemplaza el b\u00fafer de respaldo a trav\u00e9s de FBIOPUT_VSCREENINFO, los PTEs de mmap existentes no se invalidan. Al desconectar el USB, dlfb_ops_destroy() llama a vfree() en las p\u00e1ginas antiguas mientras los PTEs del espacio de usuario a\u00fan las referencian, lo que resulta en un uso despu\u00e9s de liberaci\u00f3n: el proceso retiene acceso de lectura/escritura a p\u00e1ginas del kernel liberadas.\n\nA\u00f1adir vm_operations_struct con callbacks de apertura/cierre que mantienen un mmap_count at\u00f3mico en la estructura dlfb_data. En dlfb_realloc_framebuffer(), comprobar mmap_count y devolver -EBUSY si el b\u00fafer est\u00e1 actualmente mapeado, lo que previene el reemplazo del b\u00fafer mientras el espacio de usuario mantiene PTEs obsoletos.\n\nProbado con PoC utilizando emulaci\u00f3n de dispositivo USB dummy_hcd + raw_gadget."
          }
        ],
        "id": "CVE-2026-43497",
        "lastModified": "2026-07-23T16:10:00.137",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.3,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-05-21T13:16:19.090",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/18dd358de72d57993422cbb5dfb29ccd74efe192"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4f312c30f0368e8d2a76aa650dff73f23490b5e7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5931f5651ee32bd41b3323256b31fcc8e71336ed"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/60f711cfd580f86fea8284146ac133804e728f9a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8de779dc40d35d39fa07387b6f921eb11df0f511"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a2c53a3822ee26e8d758071815b9ed3bf6669fc1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/da9b065cedfd3b574f229d5be594e6aa47a27ae6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e3d9865dacd7435b8465848428210d0f0c673311"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:38:12+00:00",
      "cve": "CVE-2026-43497",
      "id": "CVE-2026-43497",
      "initial_release_date": "2026-05-21T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43497.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-11T01:17:02Z",
      "cve": "CVE-2026-43497",
      "id": "CVE-2026-43497",
      "initial_release_date": "2026-05-22T02:20:05Z",
      "product_status:known_affected": "720",
      "product_status:recommended": "109",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43497",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43497.json",
      "version": "11"
    }
  }
}



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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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.