CVE-2023-53748 (GCVE-0-2023-53748)
Vulnerability from cvelistv5
Published
2025-12-08 01:19
Modified
2026-08-05 09:15
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: media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup variable *nplanes is provided by user via system call argument. The possible value of q_data->fmt->num_planes is 1-3, while the value of *nplanes can be 1-8. The array access by index i can cause array out-of-bounds. Fix this bug by checking *nplanes against the array size.
References
Impacted products
Vendor Product Version
Linux Linux Version: 590577a4e5257ac3ed72999a94666ad6ba8f24bc
Version: 590577a4e5257ac3ed72999a94666ad6ba8f24bc
Version: 590577a4e5257ac3ed72999a94666ad6ba8f24bc
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "48e4e06e2c5fe1fda283d499f91492eda2248bb9",
              "status": "affected",
              "version": "590577a4e5257ac3ed72999a94666ad6ba8f24bc",
              "versionType": "git"
            },
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        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.30",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.4",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup\n\nvariable *nplanes is provided by user via system call argument. The\npossible value of q_data-\u003efmt-\u003enum_planes is 1-3, while the value\nof *nplanes can be 1-8. The array access by index i can cause array\nout-of-bounds.\n\nFix this bug by checking *nplanes against the array size."
        }
      ],
      "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 through `ioctl(VIDIOC_CREATE_BUFS)` on the MediaTek decoder character device `/dev/videoN`, which requires local system access. There is no network or remote data path into `vb2ops_vdec_queue_setup()`.\nAC:L - Both `*nplanes` (up to VIDEO_MAX_PLANES=8) and every `sizes[i]` come directly from the caller\u0027s `v4l2_create_buffers` structure, so the out-of-bounds read is triggered deterministically on the first ioctl with no race, no timing window, and no dependence on memory layout the attacker cannot influence.\nPR:L - No capability check exists anywhere on the path \u2014 only `open()` on the V4L2 decoder node, which is granted to the `video` group on ChromeOS MediaTek devices and to the mediacodec/media domain on Android. A local unprivileged account or a compromised media-codec/GPU sandbox process suffices.\nUI:N - The attacker performs `open()` plus `VIDIOC_CREATE_BUFS` entirely on their own file descriptor. No victim action, no privileged helper, and no pre-existing system state are required.\nS:U - The out-of-bounds access is confined to the kernel\u0027s own heap object (`struct mtk_vcodec_ctx`) and the impact stays within the kernel security authority. No hypervisor, IOMMU, or other trust boundary is crossed.\nC:H - The `sizes[i] \u003c q_data-\u003esizeimage[i]` comparison is an attacker-controlled oracle over out-of-bounds memory, letting the `const struct mtk_video_fmt *fmt` kernel-image pointer at offset 48 be recovered bit-by-bit via binary search \u2014 a reliable KASLR/kernel-base disclosure that is the standard enabling primitive for a full local privilege-escalation chain.\nI:N - The loop only reads `q_data-\u003esizeimage[i]`; `sizes[]` is `VB2_MAX_PLANES`-sized and the writing `else` branch is bounded by `fmt-\u003enum_planes \u003c= 3`, so there is no out-of-bounds write or other modification of kernel data.\nA:H - The out-of-bounds index into the fixed three-element `sizeimage[]` array is precisely what `CONFIG_UBSAN_BOUNDS` instruments, so on the hardened Android GKI and arm64 configurations where this MediaTek codec driver actually ships, `CONFIG_UBSAN_TRAP` turns each attacker-issued ioctl into a kernel panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:46.862Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/48e4e06e2c5fe1fda283d499f91492eda2248bb9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8e19bf3b4aebd855be01b64674187dcf6d1db51"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fbcf730cb89c3647f3365226fe7014118fa93c7"
        }
      ],
      "title": "media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53748",
    "datePublished": "2025-12-08T01:19:07.318Z",
    "dateReserved": "2025-12-08T01:18:04.279Z",
    "dateUpdated": "2026-08-05T09:15:46.862Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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