CVE-2026-68108 (GCVE-0-2026-68108)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-19 16:29
VLAI
Title
drm/amdgpu/vce: fix integer overflow in image size
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vce: fix integer overflow in image size Fix a security vulnerability where malicious VCE command streams with oversized dimensions (e.g. 65536×65536) cause 32-bit integer overflow, wrapping the calculated buffer size to 0. This bypasses validation and allows GPU firmware to perform out-of-bound memory access. The fix uses 64-bit arithmetic to detect overflow and rejects invalid dimensions before they reach the hardware. V2: remove redundant check V3: modify max height value V4: remove size64 (cherry picked from commit cbe408dba581755ad1279a487ec786d8927d778d)
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c , < 893db20383800cfe92e638705984eebb13bc81a5 (git)
Affected: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c , < a07430abd556de3707adfcadcc60db3fa64e4b2b (git)
Affected: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c , < a6d7065b91a14790980ce6f4960db0ca8c3c9940 (git)
Affected: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c , < 7eebef042c12dfe0568593ee6a8926d16505925e (git)
Affected: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c , < 00c311a13d225266800c712f2b7db2711c6897de (git)
Affected: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c , < 186bfdc4e26d019b2e7570cb121964a1d89b2e5b (git)
Create a notification for this product.
Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (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)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vce: fix integer overflow in image size\n\nFix a security vulnerability where malicious VCE command streams\nwith oversized dimensions (e.g. 65536\u00d765536) cause 32-bit integer\noverflow, wrapping the calculated buffer size to 0. This bypasses\nvalidation and allows GPU firmware to perform out-of-bound memory\naccess.\n\nThe fix uses 64-bit arithmetic to detect overflow and rejects\ninvalid dimensions before they reach the hardware.\n\nV2: remove redundant check\nV3: modify max height value\nV4: remove size64\n\n(cherry picked from commit cbe408dba581755ad1279a487ec786d8927d778d)"
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            "version": "3.1"
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              "value": "AV:L - The flaw is reached only through the AMDGPU_CS DRM ioctl on a local render node (/dev/dri/renderD*); there is no network, adjacent-radio, or physical-device path to the VCE command-stream parser.\nAC:L - On affected AMD GPUs using physical-mode VCE parsing, an attacker fully controls the IB and can set create-command dimensions (e.g., 65536x65536) to deterministically overflow the 32-bit size to zero without races or uncontrollable layout conditions.\nPR:L - Exploitation requires only unprivileged local access to the amdgpu DRM render node; AMDGPU_CS is gated by DRM_AUTH|DRM_RENDER_ALLOW with no root, DRM-master, or non-namespace capability requirement.\nUI:N - No victim interaction is needed beyond the attacker submitting crafted VCE command buffers through their own render-node context; no third party must open files or take other actions.\nS:C - Bypassing size-based BO relocation/validation lets VCE firmware DMA outside the intended buffer boundaries, crossing the GPU memory-isolation boundary that kernel validation is meant to enforce on GART/VRAM mappings.\nC:H - With validation defeated, VCE firmware can read arbitrarily beyond undersized encode/context/MV buffers, exposing other GPU-accessible memory including GTT-mapped system memory and adjacent VRAM allocations.\nI:H - The same out-of-bounds VCE firmware accesses enable arbitrary writes to GPU-mapped memory beyond validated buffers, providing memory-corruption primitives suitable for privilege escalation or control-flow influence.\nA:H - Oversized VCE operations against undersized buffers can trigger GPU page faults, engine hangs, GPU resets, or broader system disruption that the attacker can repeat via further command submissions."
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    "datePublished": "2026-08-10T11:58:25.241Z",
    "dateReserved": "2026-07-30T09:28:09.368Z",
    "dateUpdated": "2026-08-19T16:29:22.109Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vce: fix integer overflow in image size\n\nFix a security vulnerability where malicious VCE command streams\nwith oversized dimensions (e.g. 65536\u00d765536) cause 32-bit integer\noverflow, wrapping the calculated buffer size to 0. This bypasses\nvalidation and allows GPU firmware to perform out-of-bound memory\naccess.\n\nThe fix uses 64-bit arithmetic to detect overflow and rejects\ninvalid dimensions before they reach the hardware.\n\nV2: remove redundant check\nV3: modify max height value\nV4: remove size64\n\n(cherry picked from commit cbe408dba581755ad1279a487ec786d8927d778d)"
          }
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        "id": "CVE-2026-68108",
        "lastModified": "2026-08-19T17:20:28.970",
        "metrics": {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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      "current_release_date": "2026-09-30T17:40:56+00:00",
      "cve": "CVE-2026-68108",
      "id": "CVE-2026-68108",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "113",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu/vce: fix integer overflow in image size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68108.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

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.



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.