{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53748", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-08T01:18:04.279Z", "datePublished": "2025-12-08T01:19:07.318Z", "dateUpdated": "2026-08-05T09:15:46.862Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:15:46.862Z" }, "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->fmt->num_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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "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's `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 — 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's 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] < q_data->sizeimage[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 — 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->sizeimage[i]`; `sizes[]` is `VB2_MAX_PLANES`-sized and the writing `else` branch is bounded by `fmt->num_planes <= 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c" ], "versions": [ { "version": "590577a4e5257ac3ed72999a94666ad6ba8f24bc", "lessThan": "48e4e06e2c5fe1fda283d499f91492eda2248bb9", "status": "affected", "versionType": "git" }, { "version": "590577a4e5257ac3ed72999a94666ad6ba8f24bc", "lessThan": "b8e19bf3b4aebd855be01b64674187dcf6d1db51", "status": "affected", "versionType": "git" }, { "version": "590577a4e5257ac3ed72999a94666ad6ba8f24bc", "lessThan": "8fbcf730cb89c3647f3365226fe7014118fa93c7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c" ], "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.30", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.4", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.1.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.3.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.4" } ] } ] } ], "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" } } } }