Vulnerability-Lookup

FKIE_CVE-2026-98142

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/cirrus-qemu: Validate BAR0 size during probe The `cirrus-qemu` driver relies on `CIRRUS_VRAM_SIZE` (4 MB) to validate framebuffer sizes. However, during PCI probe, the driver mapped BAR0 without verifying that its size matches `CIRRUS_VRAM_SIZE`. If a PCI device with a BAR0 smaller than 4 MB is bound to the driver, the mapped VRAM will be smaller than expected. Because validation checks assume 4 MB VRAM, framebuffers larger than the mapped memory can be created. When the display plane is updated (e.g. during release), `cirrus_primary_plane_helper_atomic_update()` copies the framebuffer to VRAM using `drm_fb_memcpy()`. Writing past the end of the mapped I/O memory causes a supervisor write page fault: BUG: unable to handle page fault for address: ffffc9000389c000 ... RIP: 0010:memcpy_toio+0x7c/0xe0 arch/x86/lib/iomem.c:110 ... Call Trace: <TASK> iosys_map_memcpy_to include/linux/iosys-map.h:285 [inline] drm_fb_memcpy+0x325/0x5d0 drivers/gpu/drm/drm_format_helper.c:442 cirrus_primary_plane_helper_atomic_update+0x98a/0xb00 drivers/gpu/drm/tiny/cirrus-qemu.c:358 drm_atomic_helper_commit_planes+0x626/0xea0 drivers/gpu/drm/drm_atomic_helper.c:3038 drm_atomic_helper_commit_tail+0x60/0x510 drivers/gpu/drm/drm_atomic_helper.c:1989 commit_tail+0x2b1/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:2074 drm_atomic_helper_commit+0xa77/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2312 Fix this by validating in `cirrus_pci_probe()` that the PCI BAR0 resource is not less than `CIRRUS_VRAM_SIZE`, returning `-ENODEV` if it is less.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0b5084a1f070ad1fc34e11945644ae034bbc774c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/144f51cd0ccc3ad47a6099917b7bb535611fb18f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/26bd90c886218f36c9adeab206b0e27b4384e2f6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/92312d333bf700798f92f30406c721bce87506f3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/tiny/cirrus-qemu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0b5084a1f070ad1fc34e11945644ae034bbc774c",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            },
            {
              "lessThan": "26bd90c886218f36c9adeab206b0e27b4384e2f6",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            },
            {
              "lessThan": "144f51cd0ccc3ad47a6099917b7bb535611fb18f",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            },
            {
              "lessThan": "92312d333bf700798f92f30406c721bce87506f3",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/tiny/cirrus-qemu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/cirrus-qemu: Validate BAR0 size during probe\n\nThe `cirrus-qemu` driver relies on `CIRRUS_VRAM_SIZE` (4 MB) to validate\nframebuffer sizes. However, during PCI probe, the driver mapped BAR0\nwithout verifying that its size matches `CIRRUS_VRAM_SIZE`.\n\nIf a PCI device with a BAR0 smaller than 4 MB is bound to the driver, the\nmapped VRAM will be smaller than expected. Because validation checks assume\n4 MB VRAM, framebuffers larger than the mapped memory can be created.\n\nWhen the display plane is updated (e.g. during release),\n`cirrus_primary_plane_helper_atomic_update()` copies the framebuffer to\nVRAM using `drm_fb_memcpy()`. Writing past the end of the mapped I/O memory\ncauses a supervisor write page fault:\n\nBUG: unable to handle page fault for address: ffffc9000389c000\n...\nRIP: 0010:memcpy_toio+0x7c/0xe0 arch/x86/lib/iomem.c:110\n...\nCall Trace:\n \u003cTASK\u003e\n iosys_map_memcpy_to include/linux/iosys-map.h:285 [inline]\n drm_fb_memcpy+0x325/0x5d0 drivers/gpu/drm/drm_format_helper.c:442\n cirrus_primary_plane_helper_atomic_update+0x98a/0xb00\n drivers/gpu/drm/tiny/cirrus-qemu.c:358\n drm_atomic_helper_commit_planes+0x626/0xea0\n drivers/gpu/drm/drm_atomic_helper.c:3038\n drm_atomic_helper_commit_tail+0x60/0x510\n drivers/gpu/drm/drm_atomic_helper.c:1989\n commit_tail+0x2b1/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:2074\n drm_atomic_helper_commit+0xa77/0xb10\n drivers/gpu/drm/drm_atomic_helper.c:2312\n\nFix this by validating in `cirrus_pci_probe()` that the PCI BAR0 resource\nis not less than `CIRRUS_VRAM_SIZE`, returning `-ENODEV` if it is less."
    }
  ],
  "id": "CVE-2026-98142",
  "lastModified": "2026-09-25T11:17:45.710",
  "metrics": {},
  "published": "2026-09-25T11:17:45.710",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b5084a1f070ad1fc34e11945644ae034bbc774c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/144f51cd0ccc3ad47a6099917b7bb535611fb18f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/26bd90c886218f36c9adeab206b0e27b4384e2f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/92312d333bf700798f92f30406c721bce87506f3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-98142 (GCVE-0-2026-98142)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:36 – Updated: 2026-09-25 10:36

Title

drm/cirrus-qemu: Validate BAR0 size during probe

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/0b5084a1f070ad1fc…
https://git.kernel.org/stable/c/26bd90c886218f36c…
https://git.kernel.org/stable/c/144f51cd0ccc3ad47…
https://git.kernel.org/stable/c/92312d333bf700798…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ab3e023b1b4c9887c9f0f761b47f3f0516bd3434 , < 0b5084a1f070ad1fc34e11945644ae034bbc774c (git) Affected: ab3e023b1b4c9887c9f0f761b47f3f0516bd3434 , < 26bd90c886218f36c9adeab206b0e27b4384e2f6 (git) Affected: ab3e023b1b4c9887c9f0f761b47f3f0516bd3434 , < 144f51cd0ccc3ad47a6099917b7bb535611fb18f (git) Affected: ab3e023b1b4c9887c9f0f761b47f3f0516bd3434 , < 92312d333bf700798f92f30406c721bce87506f3 (git)
Linux	Linux	Affected: 5.2 Unaffected: 0 , < 5.2 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/tiny/cirrus-qemu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0b5084a1f070ad1fc34e11945644ae034bbc774c",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            },
            {
              "lessThan": "26bd90c886218f36c9adeab206b0e27b4384e2f6",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            },
            {
              "lessThan": "144f51cd0ccc3ad47a6099917b7bb535611fb18f",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            },
            {
              "lessThan": "92312d333bf700798f92f30406c721bce87506f3",
              "status": "affected",
              "version": "ab3e023b1b4c9887c9f0f761b47f3f0516bd3434",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/tiny/cirrus-qemu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc2",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/cirrus-qemu: Validate BAR0 size during probe\n\nThe `cirrus-qemu` driver relies on `CIRRUS_VRAM_SIZE` (4 MB) to validate\nframebuffer sizes. However, during PCI probe, the driver mapped BAR0\nwithout verifying that its size matches `CIRRUS_VRAM_SIZE`.\n\nIf a PCI device with a BAR0 smaller than 4 MB is bound to the driver, the\nmapped VRAM will be smaller than expected. Because validation checks assume\n4 MB VRAM, framebuffers larger than the mapped memory can be created.\n\nWhen the display plane is updated (e.g. during release),\n`cirrus_primary_plane_helper_atomic_update()` copies the framebuffer to\nVRAM using `drm_fb_memcpy()`. Writing past the end of the mapped I/O memory\ncauses a supervisor write page fault:\n\nBUG: unable to handle page fault for address: ffffc9000389c000\n...\nRIP: 0010:memcpy_toio+0x7c/0xe0 arch/x86/lib/iomem.c:110\n...\nCall Trace:\n \u003cTASK\u003e\n iosys_map_memcpy_to include/linux/iosys-map.h:285 [inline]\n drm_fb_memcpy+0x325/0x5d0 drivers/gpu/drm/drm_format_helper.c:442\n cirrus_primary_plane_helper_atomic_update+0x98a/0xb00\n drivers/gpu/drm/tiny/cirrus-qemu.c:358\n drm_atomic_helper_commit_planes+0x626/0xea0\n drivers/gpu/drm/drm_atomic_helper.c:3038\n drm_atomic_helper_commit_tail+0x60/0x510\n drivers/gpu/drm/drm_atomic_helper.c:1989\n commit_tail+0x2b1/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:2074\n drm_atomic_helper_commit+0xa77/0xb10\n drivers/gpu/drm/drm_atomic_helper.c:2312\n\nFix this by validating in `cirrus_pci_probe()` that the PCI BAR0 resource\nis not less than `CIRRUS_VRAM_SIZE`, returning `-ENODEV` if it is less."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:36:17.832Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0b5084a1f070ad1fc34e11945644ae034bbc774c"
        },
        {
          "url": "https://git.kernel.org/stable/c/26bd90c886218f36c9adeab206b0e27b4384e2f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/144f51cd0ccc3ad47a6099917b7bb535611fb18f"
        },
        {
          "url": "https://git.kernel.org/stable/c/92312d333bf700798f92f30406c721bce87506f3"
        }
      ],
      "title": "drm/cirrus-qemu: Validate BAR0 size during probe",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98142",
    "datePublished": "2026-09-25T10:36:17.832Z",
    "dateReserved": "2026-09-25T10:25:14.319Z",
    "dateUpdated": "2026-09-25T10:36:17.832Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2026-98142

CVE-2026-98142 (GCVE-0-2026-98142)

Tags

Sightings

Nomenclature

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