CVE-2026-89818 (GCVE-0-2026-89818)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:53
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression 6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting the parser loop far past the end of the message BO. Triggering it additionally requires a ~4GiB mapping so that msg[1] survives the earlier "header does not fit in BO" check. Rewrite the test in division form, which is overflow-free by construction. Also update the message to reflect that msg is invalid.
References
Impacted products
Vendor Product Version
Linux Linux Version: 88411caee8f576d6b5abf6531232fcc0ce756dc5
Version: c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e
Version: 7688143ca62edeecacb3ba0a2cea129dbd262a18
Version: 63b51e8a9d54317d31cc3856c1e12407070d5fc2
Version: b193019860d61e92da395eae2011f2f6716b182f
Version: b193019860d61e92da395eae2011f2f6716b182f
Version: f55552adb100eb54a6e6dabff4fbdc8679bd3fa0
Version: 82c535eff05490c71153af57de9fe85502fcb5d5
Version: 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa
Version: 870c8738c3774336baedddd0240951d078a703b8
Version: 638e48ee39d0f2af9336f917a6f5d6692dd64d93
Version: e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7
Version: 3c817a60b09eaab926e475088e750936efcc95ae
Version: 6.1.175   ≤
Version: 6.6.140   ≤
Version: 6.12.90   ≤
Version: 6.18.32   ≤
Version: 5.15.209   ≤
Version: 7.0.9   ≤
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{
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            "drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c"
          ],
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check\n\nIf the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression\n6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting\nthe parser loop far past the end of the message BO. Triggering it\nadditionally requires a ~4GiB mapping so that msg[1] survives the\nearlier \"header does not fit in BO\" check.\n\nRewrite the test in division form, which is overflow-free by\nconstruction. Also update the message to reflect that msg is invalid."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only via the local DRM_IOCTL_AMDGPU_CS ioctl on /dev/dri/renderD* (amdgpu_cs_ioctl \u2192 amdgpu_cs_patch_jobs \u2192 amdgpu_cs_patch_ibs \u2192 vcn_v3/v4_0_ring_patch_cs_in_place \u2192 vcn_*_dec_msg). There is no network or physical path to the VCN decode-message parser.\nAC:L - The attacker fully controls the decode-message GEM BO. Setting num_buffers to 0x3FFFFFFF with a ~4GiB mapping makes 6+num_buffers*4 wrap to 2 so the uint32 bounds check passes deterministically; allocating that mapping is attacker-controlled on typical GPU workstations and cloud GPU hosts.\nPR:L - AMDGPU_CS is registered with DRM_AUTH|DRM_RENDER_ALLOW, so any unprivileged local user who can open the AMDGPU render node (typical render/video group on desktops, handhelds, Android, and GPU cloud instances) can submit VCN command buffers without root.\nUI:N - The attacker submits the crafted VCN command buffer through their own DRM context; no separate victim action such as opening a file or mounting a filesystem is required.\nS:U - The out-of-bounds read is performed by the CPU in the kernel kmap of the message BO and stays within the kernel security authority; it is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - Bypassing the buffer-count check lets the parser loop about 0x3FFFFFFF times, each step reading 16 bytes past the kmapped BO, an unbounded kernel out-of-bounds read well beyond a few bytes.\nI:N - The loop only reads message dwords and, when a CREATE record is seen, still bounds-checks offset/size against the BO before any further access; no out-of-bounds write or control-flow hijack primitive is produced.\nA:H - The unbounded walk past the kmapped BO into unmapped kernel or MMIO address space causes a page fault/oops, and the billion-iteration loop can also soft-lock the CS path before faulting."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:12.347Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b"
        },
        {
          "url": "https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e"
        }
      ],
      "title": "drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89818",
    "datePublished": "2026-09-16T10:30:50.946Z",
    "dateReserved": "2026-09-11T19:38:34.768Z",
    "dateUpdated": "2026-10-19T08:53:12.347Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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