Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-06-03 15:50 – Updated: 2026-06-03 15:50

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

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/29f3824b08a98d41e…
https://git.kernel.org/stable/c/263e28add4f4472cf…
https://git.kernel.org/stable/c/ca3808d560ad946ab…
https://git.kernel.org/stable/c/abde491143e4e12ee…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < 29f3824b08a98d41ecbbfd33580630d7607f962e (git) Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < 263e28add4f4472cfa95150d218955d1945aa413 (git) Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < ca3808d560ad946ab6d089fd1f5bee04b952ead4 (git) Affected: 2728e9c7c84235d2d7bc1403174d071ffc82d6d2 , < abde491143e4e12eecc41337910aace4e8d59603 (git)
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)

Show details on NVD website

JSON

To clipboard

{
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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",
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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",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
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              "version": "6.19.4",
              "versionType": "semver"
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          "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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-03T15:50:02.572Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603"
        }
      ],
      "title": "drm/amd/display: Fix out-of-bounds stream encoder index v3",
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    "cveId": "CVE-2026-46263",
    "datePublished": "2026-06-03T15:50:02.572Z",
    "dateReserved": "2026-05-13T15:03:33.108Z",
    "dateUpdated": "2026-06-03T15:50:02.572Z",
    "state": "PUBLISHED"
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  }
}

FKIE_CVE-2026-46263

Vulnerability from fkie_nvd - Published: 2026-06-03 18:16 - Updated: 2026-06-03 18:16

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca3808d560ad946ab6d089fd1f5bee04b952ead4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "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)"
    }
  ],
  "id": "CVE-2026-46263",
  "lastModified": "2026-06-03T18:16:27.743",
  "metrics": {},
  "published": "2026-06-03T18:16:27.743",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e"
    },
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-8H36-WFWW-P7V6

Vulnerability from github – Published: 2026-06-03 18:33 – Updated: 2026-06-03 18:33

Details

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)

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-46263"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-03T18:16:27Z",
    "severity": null
  },
  "details": "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)",
  "id": "GHSA-8h36-wfww-p7v6",
  "modified": "2026-06-03T18:33:12Z",
  "published": "2026-06-03T18:33:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46263"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca3808d560ad946ab6d089fd1f5bee04b952ead4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

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

FKIE_CVE-2026-46263

GHSA-8H36-WFWW-P7V6

Tags

Sightings

Nomenclature