236 lines
14 KiB
JSON
236 lines
14 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-2026-46263",
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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": "2026-05-13T15:03:33.108Z",
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"datePublished": "2026-06-03T15:50:02.572Z",
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"dateUpdated": "2026-10-19T19:36:56.301Z"
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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": "2026-08-05T12:30:50.295Z"
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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\ndrm/amd/display: Fix out-of-bounds stream encoder index v3\n\neng_id can be negative and that stream_enc_regs[]\ncan be indexed out of bounds.\n\neng_id is used directly as an index into stream_enc_regs[], which has\nonly 5 entries. When eng_id is 5 (ENGINE_ID_DIGF) or negative, this can\naccess memory past the end of the array.\n\nAdd a bounds check using ARRAY_SIZE() before using eng_id as an index.\nThe unsigned cast also rejects negative values.\n\nThis avoids out-of-bounds access.\n\nFixes the below smatch error:\ndcn*_resource.c: stream_encoder_create() may index\nstream_enc_regs[eng_id] out of bounds (size 5).\n\ndrivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn351/dcn351_resource.c\n 1246 static struct stream_encoder *dcn35_stream_encoder_create(\n 1247 enum engine_id eng_id,\n 1248 struct dc_context *ctx)\n 1249 {\n\n ...\n\n 1255\n 1256 /* Mapping of VPG, AFMT, DME register blocks to DIO block instance */\n 1257 if (eng_id <= ENGINE_ID_DIGF) {\n\nENGINE_ID_DIGF is 5. should <= be <?\n\nUnrelated but, ugh, why is Smatch saying that \"eng_id\" can be negative?\nend_id is type signed long, but there are checks in the caller which prevent it from being negative.\n\n 1258 vpg_inst = eng_id;\n 1259 afmt_inst = eng_id;\n 1260 } else\n 1261 return NULL;\n 1262\n\n ...\n\n 1281\n 1282 dcn35_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios,\n 1283 eng_id, vpg, afmt,\n--> 1284 &stream_enc_regs[eng_id],\n ^^^^^^^^^^^^^^^^^^^^^^^ This stream_enc_regs[] array has 5 elements so we are one element beyond the end of the array.\n\n ...\n\n 1287 return &enc1->base;\n 1288 }\n\nv2: use explicit bounds check as suggested by Roman/Dan; avoid unsigned int cast\n\nv3: The compiler already knows how to compare the two values, so the\n cast (int) is not needed. (Roman)"
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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 flaw is in AMDGPU display core initialization (dc_create/resource_construct during GPU probe), reachable only from the local kernel context, not from the network or physical buses.\nAC:L - When an out-of-range eng_id is passed, the out-of-bounds index is deterministic with no race; the off-by-one check reliably allows ENGINE_ID_DIGF (5) past validation.\nPR:L - Exploitation requires local access on a system with a vulnerable AMD DCN3.x GPU driver loaded; typical desktop/cloud-GPU tenants have local DRM access without real root, though module reload generally needs elevated privileges.\nUI:N - No victim interaction is required; the bug fires during driver/display-core initialization, not from opening a file or approving a prompt.\nS:U - Impact stays within kernel/GPU driver context (wrong MMIO register maps, memory corruption); it does not cross a VM/hypervisor or IOMMU security boundary by itself.\nC:H - Out-of-bounds indexing of stream_enc_regs[] reads adjacent kernel memory into encoder register descriptors, which is an unbounded kernel memory disclosure primitive per kernel CVSS guidance.\nI:H - The corrupted register block pointer is used for subsequent GPU MMIO writes through stream-encoder helpers, enabling misdirected hardware register modification and potential control of display hardware state.\nA:H - Invalid register mappings and out-of-bounds kernel reads can cause kernel oops/panic or GPU hang when display paths are exercised, matching kernel guidance for crash-class availability impact."
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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/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c"
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],
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"versions": [
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{
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"version": "2728e9c7c84235d2d7bc1403174d071ffc82d6d2",
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"lessThan": "29f3824b08a98d41ecbbfd33580630d7607f962e",
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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": "2728e9c7c84235d2d7bc1403174d071ffc82d6d2",
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"lessThan": "263e28add4f4472cfa95150d218955d1945aa413",
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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": "2728e9c7c84235d2d7bc1403174d071ffc82d6d2",
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"lessThan": "ca3808d560ad946ab6d089fd1f5bee04b952ead4",
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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": "2728e9c7c84235d2d7bc1403174d071ffc82d6d2",
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"lessThan": "abde491143e4e12eecc41337910aace4e8d59603",
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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/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c",
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"drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c"
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],
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"versions": [
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{
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"version": "6.9",
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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": "6.9",
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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": "6.12.75",
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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": "6.18.14",
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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": "6.19.4",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.12.75"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.18.14"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.19.4"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e"
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},
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{
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"url": "https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413"
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},
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{
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"url": "https://git.kernel.org/stable/c/ca3808d560ad946ab6d089fd1f5bee04b952ead4"
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},
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{
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"url": "https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603"
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}
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],
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"title": "drm/amd/display: Fix out-of-bounds stream encoder index v3",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-46263",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:21:27.958639Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T19:36:56.301Z"
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}
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}
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]
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}
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} |