243 lines
13 KiB
JSON
243 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-97576",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-24T16:01:01.156Z",
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"datePublished": "2026-09-25T10:21:59.298Z",
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"dateUpdated": "2026-10-19T09:09:38.813Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:09:38.813Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate HEVC tile counts\n\nThe stateless HEVC decoders read num_tile_columns_minus1 + 1 entries from\ncolumn_width_minus1[] and num_tile_rows_minus1 + 1 from row_height_minus1[]\nand use them as tile-loop bounds, but std_validate_compound() does not\nbound these u8 counts. Reject a V4L2_CTRL_TYPE_HEVC_PPS with tiling\nenabled whose tile counts exceed the uAPI array capacity, mirroring the\nexisting compound-control range checks."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The attacker-controlled bytes are num_tile_columns_minus1, num_tile_rows_minus1 and column_width_minus1[]/row_height_minus1[] in struct v4l2_ctrl_hevc_pps, copied from userspace by VIDIOC_S_EXT_CTRLS through v4l_s_ext_ctrls → v4l2_s_ext_ctrls → user_to_new into std_validate_compound(); no network protocol carries those fields.\nAC:L - Setting V4L2_HEVC_PPS_FLAG_TILES_ENABLED with num_tile_columns_minus1>=20 or num_tile_rows_minus1>=22 is enough; the next decode job (hantro_g2_hevc_dec_run→prepare_tile_info_buffer, rkvdec assemble_hw_pps→compute_tiles_non_uniform, or cedrus_h265_setup→cedrus_h265_write_tiles) uses those u8 counts as loop bounds with no race or hardware-fault precondition.\nPR:L - rkvdec_open(), hantro_open() and cedrus_open() perform no capable() check; v4l2_open only requires opening the decoder /dev/videoN. On Rockchip, Allwinner and Hantro devices that node is granted to unprivileged video-group or Android media-client users, not init-namespace root.\nUI:N - The attacking process opens the HEVC decoder itself, issues VIDIOC_S_EXT_CTRLS with the crafted V4L2_CTRL_TYPE_HEVC_PPS, then QBUF/STREAMON via the request API. No separate victim mount, file-open, or playback action is required.\nS:U - The overflows remain in kernel stack (vdpu383 assemble_hw_pps column_width[22]), hantro tile_sizes DMA memory, and the rkvdec param_set PPS packet. This is kernel memory corruption under the same security authority, not a VM, IOMMU, or sandbox escape.\nC:H - cedrus_h265_write_tiles() and compute_tiles_non_uniform() index column_width_minus1[20] and row_height_minus1[22] with a u8 count up to 255, reading past the v4l2_ctrl_hevc_pps object into adjacent kernel heap that is then copied into stack and DMA tile buffers.\nI:H - compute_tiles_non_uniform() writes attacker-chosen column_width_minus1[i]+1 values past stack arrays column_width[20/22]; prepare_tile_info_buffer() writes up to 256x256 u16 pairs into a 20x22 tile_sizes DMA buffer; rkvdec_set_bw_field() stores COLUMN_WIDTH(i) past the 80-byte PPS packet.\nA:H - The stack smash of column_width/row_height, the tile_sizes DMA overflow, and rkvdec_set_bw_field() writes past param_set can walk into unmapped or poisoned memory and oops the kernel, and can wedge the HEVC decoder hardware. The trigger is repeatable at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/media/v4l2-core/v4l2-ctrls-core.c"
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],
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"versions": [
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{
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"version": "256fa3920874b0f1f4cb79ad6766493a22187153",
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"lessThan": "9c0a718e24d4cd6d975f3df9740f968f62891a20",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "256fa3920874b0f1f4cb79ad6766493a22187153",
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"lessThan": "975e0180488966bb709092a52408604bd4f4edd9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "256fa3920874b0f1f4cb79ad6766493a22187153",
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"lessThan": "724915535558b14c111ad8a498b896026dfe8d20",
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"status": "affected",
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"status": "affected",
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{
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"lessThan": "c7b1ef6dc57f4e57fe27cfdd3bf82033ed91ca34",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "256fa3920874b0f1f4cb79ad6766493a22187153",
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"lessThan": "ba1023d3a6d5d244d59f20c4ba6af4879ae08a9f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "256fa3920874b0f1f4cb79ad6766493a22187153",
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"lessThan": "dc694a9929f7cb9c88ef91e45eb982b7bbe5a477",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/media/v4l2-core/v4l2-ctrls-core.c"
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],
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"versions": [
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{
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"version": "5.5",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.5",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.5",
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"versionEndExcluding": "5.15.222"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/9c0a718e24d4cd6d975f3df9740f968f62891a20"
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},
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{
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"url": "https://git.kernel.org/stable/c/975e0180488966bb709092a52408604bd4f4edd9"
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},
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{
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"url": "https://git.kernel.org/stable/c/724915535558b14c111ad8a498b896026dfe8d20"
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},
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{
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"url": "https://git.kernel.org/stable/c/400cd78a63cc647412cf069c9851bdea2818340c"
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},
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{
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"url": "https://git.kernel.org/stable/c/c7b1ef6dc57f4e57fe27cfdd3bf82033ed91ca34"
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},
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{
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"url": "https://git.kernel.org/stable/c/ba1023d3a6d5d244d59f20c4ba6af4879ae08a9f"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc694a9929f7cb9c88ef91e45eb982b7bbe5a477"
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}
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],
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"title": "media: v4l2-ctrls: validate HEVC tile counts",
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