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CVE-2026-46263 (GCVE-0-2026-46263)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:50 – Updated: 2026-08-05 12:30
VLAI
Title
drm/amd/display: Fix out-of-bounds stream encoder index v3
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix out-of-bounds stream encoder index v3 eng_id can be negative and that stream_enc_regs[] can be indexed out of bounds. eng_id is used directly as an index into stream_enc_regs[], which has only 5 entries. When eng_id is 5 (ENGINE_ID_DIGF) or negative, this can access memory past the end of the array. Add a bounds check using ARRAY_SIZE() before using eng_id as an index. The unsigned cast also rejects negative values. This avoids out-of-bounds access. Fixes the below smatch error: dcn*_resource.c: stream_encoder_create() may index stream_enc_regs[eng_id] out of bounds (size 5). drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn351/dcn351_resource.c 1246 static struct stream_encoder *dcn35_stream_encoder_create( 1247 enum engine_id eng_id, 1248 struct dc_context *ctx) 1249 { ... 1255 1256 /* Mapping of VPG, AFMT, DME register blocks to DIO block instance */ 1257 if (eng_id <= ENGINE_ID_DIGF) { ENGINE_ID_DIGF is 5. should <= be <? Unrelated but, ugh, why is Smatch saying that "eng_id" can be negative? end_id is type signed long, but there are checks in the caller which prevent it from being negative. 1258 vpg_inst = eng_id; 1259 afmt_inst = eng_id; 1260 } else 1261 return NULL; 1262 ... 1281 1282 dcn35_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios, 1283 eng_id, vpg, afmt, --> 1284 &stream_enc_regs[eng_id], ^^^^^^^^^^^^^^^^^^^^^^^ This stream_enc_regs[] array has 5 elements so we are one element beyond the end of the array. ... 1287 return &enc1->base; 1288 } v2: use explicit bounds check as suggested by Roman/Dan; avoid unsigned int cast v3: The compiler already knows how to compare the two values, so the cast (int) is not needed. (Roman)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < 29f3824b08a98d41ecbbfd33580630d7607f962e (git)
Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < 263e28add4f4472cfa95150d218955d1945aa413 (git)
Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < ca3808d560ad946ab6d089fd1f5bee04b952ead4 (git)
Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < abde491143e4e12eecc41337910aace4e8d59603 (git)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c"
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            "drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c",
            "drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c"
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      "descriptions": [
        {
          "lang": "en",
          "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 \u003c= ENGINE_ID_DIGF) {\n\nENGINE_ID_DIGF is 5.  should \u003c= be \u003c?\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-\u003edc_bios,\n    1283                                         eng_id, vpg, afmt,\n--\u003e 1284                                         \u0026stream_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 \u0026enc1-\u003ebase;\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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            "version": "3.1"
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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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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:50.295Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e"
        },
        {
          "url": "https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca3808d560ad946ab6d089fd1f5bee04b952ead4"
        },
        {
          "url": "https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603"
        }
      ],
      "title": "drm/amd/display: Fix out-of-bounds stream encoder index v3",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46263",
    "datePublished": "2026-06-03T15:50:02.572Z",
    "dateReserved": "2026-05-13T15:03:33.108Z",
    "dateUpdated": "2026-08-05T12:30:50.295Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46263",
      "date": "2026-09-17",
      "epss": "0.0012",
      "percentile": "0.0207"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46263\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:27.743\",\"lastModified\":\"2026-07-22T20:10:00.127\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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 \u003c= ENGINE_ID_DIGF) {\\n\\nENGINE_ID_DIGF is 5.  should \u003c= be \u003c?\\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-\u003edc_bios,\\n    1283                                         eng_id, vpg, afmt,\\n--\u003e 1284                                         \u0026stream_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 \u0026enc1-\u003ebase;\\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)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\ndrm/amd/display: Correcci\u00f3n de \u00edndice de codificador de flujo fuera de l\u00edmites v3\\n\\neng_id puede ser negativo y que stream_enc_regs[]\\npuede ser indexado fuera de l\u00edmites.\\n\\neng_id se usa directamente como un \u00edndice en stream_enc_regs[], que tiene\\nsolo 5 entradas. Cuando eng_id es 5 (ENGINE_ID_DIGF) o negativo, esto puede\\nacceder a memoria m\u00e1s all\u00e1 del final del array.\\n\\nA\u00f1adir una comprobaci\u00f3n de l\u00edmites usando ARRAY_SIZE() antes de usar eng_id como un \u00edndice.\\nLa conversi\u00f3n a tipo sin signo tambi\u00e9n rechaza valores negativos.\\n\\nEsto evita el acceso fuera de l\u00edmites.\\n\\nCorrige el siguiente error de smatch:\\ndcn_resource.c: stream_encoder_create() puede indexar\\nstream_enc_regs[eng_id] fuera de l\u00edmites (tama\u00f1o 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         /* Mapeo de bloques de registro VPG, AFMT, DME a instancia de bloque DIO */\\n    1257         if (eng_id \u003c= ENGINE_ID_DIGF) {\\n\\nENGINE_ID_DIGF es 5. \u00bfdeber\u00eda \u003c= ser \u003c?\\n\\nSin relaci\u00f3n, pero, ugh, \u00bfpor qu\u00e9 Smatch dice que \u0027eng_id\u0027 puede ser negativo?\\nend_id es de tipo signed long, pero hay comprobaciones en la funci\u00f3n llamadora que impiden que sea negativo.\\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-\u003edc_bios,\\n    1283                                         eng_id, vpg, afmt,\\n--\u003e 1284                                         \u0026stream_enc_regs[eng_id],\\n                                                  ^^^^^^^^^^^^^^^^^^^^^^^ Este array stream_enc_regs[] tiene 5 elementos, por lo que estamos un elemento m\u00e1s all\u00e1 del final del array.\\n\\n    ...\\n\\n    1287         return \u0026enc1-\u003ebase;\\n    1288 }\\n\\nv2: usar comprobaci\u00f3n de l\u00edmites expl\u00edcita como sugirieron Roman/Dan; evitar conversi\u00f3n a unsigned int\\n\\nv3: El compilador ya sabe c\u00f3mo comparar los dos valores, por lo que la\\n    conversi\u00f3n (int) no es necesaria. (Roman)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\"lessThan\":\"29f3824b08a98d41ecbbfd33580630d7607f962e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\"lessThan\":\"263e28add4f4472cfa95150d218955d1945aa413\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\"lessThan\":\"ca3808d560ad946ab6d089fd1f5bee04b952ead4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\"lessThan\":\"abde491143e4e12eecc41337910aace4e8d59603\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c\",\"drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.14\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.9\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"F8A1C6F6-2847-4C53-ABFC-8F07D96900D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.14\",\"matchCriteriaId\":\"BF463CB7-1F58-4607-B847-77ED23E4B9B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.4\",\"matchCriteriaId\":\"672A3E79-EC03-479D-8503-361DFBDC8092\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ca3808d560ad946ab6d089fd1f5bee04b952ead4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-01T13:38:38+00:00",
      "cve": "CVE-2026-46263",
      "id": "CVE-2026-46263",
      "initial_release_date": "2026-06-03T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amd/display: Fix out-of-bounds stream encoder index v3",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46263.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.