CVE-2023-53748 (GCVE-0-2023-53748)

Vulnerability from cvelistv5 – Published: 2025-12-08 01:19 – Updated: 2026-08-05 09:15
VLAI
Title
media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 590577a4e5257ac3ed72999a94666ad6ba8f24bc , < 48e4e06e2c5fe1fda283d499f91492eda2248bb9 (git)
Affected: 590577a4e5257ac3ed72999a94666ad6ba8f24bc , < b8e19bf3b4aebd855be01b64674187dcf6d1db51 (git)
Affected: 590577a4e5257ac3ed72999a94666ad6ba8f24bc , < 8fbcf730cb89c3647f3365226fe7014118fa93c7 (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 6.1.30 , ≤ 6.1.* (semver)
Unaffected: 6.3.4 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c"
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        }
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              "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."
            }
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        "dateUpdated": "2026-08-05T09:15:46.862Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/8fbcf730cb89c3647f3365226fe7014118fa93c7"
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    "dateReserved": "2025-12-08T01:18:04.279Z",
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            "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."
          }
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        "lastModified": "2026-08-04T10:19:19.703",
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                "confidentialityImpact": "HIGH",
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      "cve": "CVE-2023-53748",
      "id": "CVE-2023-53748",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: mediatek: vcodec: Fix potential array out-of-bounds in decoder queue_setup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53748.json",
      "version": "3"
    },
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      "current_release_date": "2026-08-29T02:05:16Z",
      "cve": "CVE-2023-53748",
      "id": "CVE-2023-53748",
      "initial_release_date": "2025-12-09T00:29:22Z",
      "product_status:known_affected": "688",
      "product_status:known_not_affected": "203",
      "product_status:recommended": "23",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53748",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53748.json",
      "version": "21"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • 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.



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