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CVE-2026-68106 (GCVE-0-2026-68106)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-19 16:29
VLAI
Title
drm/amdgpu: fix division by zero with invalid uvd dimensions
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix division by zero with invalid uvd dimensions When width or height is less than 16, width_in_mb or height_in_mb becomes 0, leading to fs_in_mb being 0. This causes a division by zero when calculating num_dpb_buffer in H264 and H264 Perf decode paths. Add validation to reject frames with width < 16 or height < 16 before performing any calculations that depend on these values. V2: Format change - move up all vaiable definitions. V3: Use warn_once to avoid spam. (cherry picked from commit 3e41d26c70b0a459d041cc19482a226c4b7423cb)
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: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 004d0453cfef16f056cb7b8bc04f69f19cf9df32 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 00ee64910ecf748cc15b23bbcbea472c203ec1e8 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 81c9b4921f62d1642b9d775524ae9240e521a5ed (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 52f9a588296432accf2982f7d258192a37562f4f (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < a00946b5ab7c25da5685ca9c58f50ff6f43c0fdf (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < ffb33d466a68cea3e8a3dbed04d79037a3cbabd1 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < be725ab23aa45c11a5afef3e2a9f6d8c084ae5dc (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 0c01c811be47e6b146552dd59bfedbea8f09b8f4 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The flaw is reached only via the AMDGPU_CS DRM ioctl on a local render node (/dev/dri/renderD*), traversing amdgpu_cs_ioctl, amdgpu_cs_patch_ibs, amdgpu_uvd_ring_parse_cs, and amdgpu_uvd_cs_msg_decode; it is not reachable from any network-facing kernel service.\nAC:L - An attacker with render-node access fully controls the UVD decode message fields (stream_type H264/H264 Perf, width, height, level) in their own BO and can reliably trigger width or height \u003c 16 after creating a valid UVD session handle.\nPR:L - Exploitation requires only standard unprivileged local access to the AMDGPU DRM render node (DRM_AUTH|DRM_RENDER_ALLOW on AMDGPU_CS), not root or capabilities outside the render/video group; user namespaces do not grant this access by themselves.\nUI:N - No victim interaction is required; a local attacker can directly submit a crafted UVD command stream through AMDGPU_CS ioctl without needing another user to open media, mount a filesystem, or take any other action.\nS:U - Impact is confined to the kernel/GPU driver security domain on the local host (kernel oops or GPU memory corruption within the attacker\u0027s DRM client); it does not cross VM, IOMMU, or sandbox boundaries to affect a different security authority.\nC:H - On x86, kernel-mode divide-by-zero causes a fatal trap; on architectures where unsigned division by zero returns zero, underestimated DPB buffer sizes can pass validation, enabling GPU out-of-bounds reads of adjacent mapped buffers that may hold sensitive data.\nI:H - Underestimated buffer-size calculations from zero macroblock counts can let undersized DPB buffers pass kernel validation, permitting the UVD engine to perform out-of-bounds writes into adjacent GPU-mapped memory that could be leveraged for further memory corruption.\nA:H - Triggering the divide-by-zero in kernel context during CS parsing causes an x86 divide-error exception leading to die()/kernel oops, crashing or hanging the system; repeated submissions can deny GPU/video availability on affected UVD hardware (v3.1-v6.0)."
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    "dateReserved": "2026-07-30T09:28:09.368Z",
    "dateUpdated": "2026-08-19T16:29:19.954Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix division by zero with invalid uvd dimensions\n\nWhen width or height is less than 16, width_in_mb or height_in_mb\nbecomes 0, leading to fs_in_mb being 0. This causes a division by\nzero when calculating num_dpb_buffer in H264 and H264 Perf decode\npaths.\n\nAdd validation to reject frames with width \u003c 16 or height \u003c 16\nbefore performing any calculations that depend on these values.\n\nV2: Format change - move up all vaiable definitions.\nV3: Use warn_once to avoid spam.\n\n(cherry picked from commit 3e41d26c70b0a459d041cc19482a226c4b7423cb)"
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        "id": "CVE-2026-68106",
        "lastModified": "2026-08-19T17:20:28.713",
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                "scope": "UNCHANGED",
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        "published": "2026-08-10T13:19:55.347",
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:15:58+00:00",
      "cve": "CVE-2026-68106",
      "id": "CVE-2026-68106",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu: fix division by zero with invalid uvd dimensions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68106.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:36:03Z",
      "cve": "CVE-2026-68106",
      "id": "CVE-2026-68106",
      "initial_release_date": "2026-08-13T01:28:23Z",
      "product_status:known_affected": "687",
      "product_status:known_not_affected": "61",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68106",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68106.json",
      "version": "8"
    }
  }
}



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Taxonomy of the tags.





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.