Vulnerability-Lookup

CVE-2026-46245 (GCVE-0-2026-46245)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-03 15:49

Title

drm/amd/display: Fix dc_link NULL handling in HPD init

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix dc_link NULL handling in HPD init amdgpu_dm_hpd_init() may see connectors without a valid dc_link. The code already checks dc_link for the polling decision, but later unconditionally dereferences it when setting up HPD interrupts. Assign dc_link early and skip connectors where it is NULL. Fixes the below: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c:940 amdgpu_dm_hpd_init() error: we previously assumed 'dc_link' could be null (see line 931) drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c 923 /* 924 * Analog connectors may be hot-plugged unlike other connector 925 * types that don't support HPD. Only poll analog connectors. 926 */ 927 use_polling |= 928 amdgpu_dm_connector->dc_link && ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The patch adds this NULL check but hopefully it can be removed 929 dc_connector_supports_analog(amdgpu_dm_connector->dc_link->link_id.id); 930 931 dc_link = amdgpu_dm_connector->dc_link; dc_link assigned here. 932 933 /* 934 * Get a base driver irq reference for hpd ints for the lifetime 935 * of dm. Note that only hpd interrupt types are registered with 936 * base driver; hpd_rx types aren't. IOW, amdgpu_irq_get/put on 937 * hpd_rx isn't available. DM currently controls hpd_rx 938 * explicitly with dc_interrupt_set() 939 */ --> 940 if (dc_link->irq_source_hpd != DC_IRQ_SOURCE_INVALID) { ^^^^^^^^^^^^^^^^^^^^^^^ If it's NULL then we are trouble because we dereference it here. 941 irq_type = dc_link->irq_source_hpd - DC_IRQ_SOURCE_HPD1; 942 /* 943 * TODO: There's a mismatch between mode_info.num_hpd 944 * and what bios reports as the # of connectors with hpd

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/a490e4d3c9fed1e69…
https://git.kernel.org/stable/c/226a40c06a183abae…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < a490e4d3c9fed1e690c8de348416eea3a9f054ff (git) Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 226a40c06a183abaeb7529a4f54d6c203bd14407 (git)	guessed
Linux	Linux	Affected: 4.15 Unaffected: 0 , < 4.15 (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)	guessed

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          "programFiles": [
            "drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix dc_link NULL handling in HPD init\n\namdgpu_dm_hpd_init() may see connectors without a valid dc_link.\n\nThe code already checks dc_link for the polling decision, but later\nunconditionally dereferences it when setting up HPD interrupts.\n\nAssign dc_link early and skip connectors where it is NULL.\n\nFixes the below:\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c:940 amdgpu_dm_hpd_init()\nerror: we previously assumed \u0027dc_link\u0027 could be null (see line 931)\n\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c\n    923                 /*\n    924                  * Analog connectors may be hot-plugged unlike other connector\n    925                  * types that don\u0027t support HPD. Only poll analog connectors.\n    926                  */\n    927                 use_polling |=\n    928                         amdgpu_dm_connector-\u003edc_link \u0026\u0026\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The patch adds this NULL check but hopefully it can be removed\n\n    929                         dc_connector_supports_analog(amdgpu_dm_connector-\u003edc_link-\u003elink_id.id);\n    930\n    931                 dc_link = amdgpu_dm_connector-\u003edc_link;\n\ndc_link assigned here.\n\n    932\n    933                 /*\n    934                  * Get a base driver irq reference for hpd ints for the lifetime\n    935                  * of dm. Note that only hpd interrupt types are registered with\n    936                  * base driver; hpd_rx types aren\u0027t. IOW, amdgpu_irq_get/put on\n    937                  * hpd_rx isn\u0027t available. DM currently controls hpd_rx\n    938                  * explicitly with dc_interrupt_set()\n    939                  */\n--\u003e 940                 if (dc_link-\u003eirq_source_hpd != DC_IRQ_SOURCE_INVALID) {\n                            ^^^^^^^^^^^^^^^^^^^^^^^ If it\u0027s NULL then we are trouble because we dereference it here.\n\n    941                         irq_type = dc_link-\u003eirq_source_hpd - DC_IRQ_SOURCE_HPD1;\n    942                         /*\n    943                          * TODO: There\u0027s a mismatch between mode_info.num_hpd\n    944                          * and what bios reports as the # of connectors with hpd"
        }
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        "dateUpdated": "2026-06-03T15:49:40.645Z",
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          "url": "https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407"
        }
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      "title": "drm/amd/display: Fix dc_link NULL handling in HPD init",
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    "cveId": "CVE-2026-46245",
    "datePublished": "2026-06-03T15:49:40.645Z",
    "dateReserved": "2026-05-13T15:03:33.107Z",
    "dateUpdated": "2026-06-03T15:49:40.645Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-46245",
      "date": "2026-09-17",
      "epss": "0.00108",
      "percentile": "0.01343"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-12T23:55:11.000Z",
      "cve": "CVE-2026-46245",
      "id": "msrc_CVE-2026-46245",
      "initial_release_date": "2026-06-05T01:01:20.000Z",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/amd/display: Fix dc_link NULL handling in HPD init",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46245.json",
      "version": "5"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46245\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:24.637\",\"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 dc_link NULL handling in HPD init\\n\\namdgpu_dm_hpd_init() may see connectors without a valid dc_link.\\n\\nThe code already checks dc_link for the polling decision, but later\\nunconditionally dereferences it when setting up HPD interrupts.\\n\\nAssign dc_link early and skip connectors where it is NULL.\\n\\nFixes the below:\\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c:940 amdgpu_dm_hpd_init()\\nerror: we previously assumed \u0027dc_link\u0027 could be null (see line 931)\\n\\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c\\n    923                 /*\\n    924                  * Analog connectors may be hot-plugged unlike other connector\\n    925                  * types that don\u0027t support HPD. Only poll analog connectors.\\n    926                  */\\n    927                 use_polling |=\\n    928                         amdgpu_dm_connector-\u003edc_link \u0026\u0026\\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The patch adds this NULL check but hopefully it can be removed\\n\\n    929                         dc_connector_supports_analog(amdgpu_dm_connector-\u003edc_link-\u003elink_id.id);\\n    930\\n    931                 dc_link = amdgpu_dm_connector-\u003edc_link;\\n\\ndc_link assigned here.\\n\\n    932\\n    933                 /*\\n    934                  * Get a base driver irq reference for hpd ints for the lifetime\\n    935                  * of dm. Note that only hpd interrupt types are registered with\\n    936                  * base driver; hpd_rx types aren\u0027t. IOW, amdgpu_irq_get/put on\\n    937                  * hpd_rx isn\u0027t available. DM currently controls hpd_rx\\n    938                  * explicitly with dc_interrupt_set()\\n    939                  */\\n--\u003e 940                 if (dc_link-\u003eirq_source_hpd != DC_IRQ_SOURCE_INVALID) {\\n                            ^^^^^^^^^^^^^^^^^^^^^^^ If it\u0027s NULL then we are trouble because we dereference it here.\\n\\n    941                         irq_type = dc_link-\u003eirq_source_hpd - DC_IRQ_SOURCE_HPD1;\\n    942                         /*\\n    943                          * TODO: There\u0027s a mismatch between mode_info.num_hpd\\n    944                          * and what bios reports as the # of connectors with hpd\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\ndrm/amd/display: Correcci\u00f3n del manejo de dc_link NULL en la inicializaci\u00f3n de HPD\\n\\namdgpu_dm_hpd_init() puede encontrar conectores sin un dc_link v\u00e1lido.\\n\\nEl c\u00f3digo ya verifica dc_link para la decisi\u00f3n de sondeo, pero luego lo desreferencia incondicionalmente al configurar las interrupciones HPD.\\n\\nAsigne dc_link con antelaci\u00f3n y omita los conectores donde sea NULL.\\n\\nSoluciona lo siguiente:\\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c:940 amdgpu_dm_hpd_init()\\nerror: previamente asumimos que \u0027dc_link\u0027 podr\u00eda ser nulo (ver l\u00ednea 931)\\n\\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c\\n    923                 /*\\n    924                  * Los conectores anal\u00f3gicos pueden ser conectados en caliente a diferencia de otros tipos de conectores\\n    925                  * que no soportan HPD. Solo sondee los conectores anal\u00f3gicos.\\n    926                  */\\n    927                 use_polling |=\\n    928                         amdgpu_dm_connector-\u003edc_link \u0026\u0026\\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ El parche a\u00f1ade esta verificaci\u00f3n de NULL pero ojal\u00e1 pueda ser eliminada\\n\\n    929                         dc_connector_supports_analog(amdgpu_dm_connector-\u003edc_link-\u003elink_id.id);\\n    930\\n    931                 dc_link = amdgpu_dm_connector-\u003edc_link;\\n\\ndc_link asignado aqu\u00ed.\\n\\n    932\\n    933                 /*\\n    934                  * Obtenga una referencia de irq del controlador base para las interrupciones hpd durante la vida \u00fatil\\n    935                  * de dm. Tenga en cuenta que solo los tipos de interrupci\u00f3n hpd se registran con\\n    936                  * el controlador base; los tipos hpd_rx no lo est\u00e1n. En otras palabras, amdgpu_irq_get/put en\\n    937                  * hpd_rx no est\u00e1 disponible. DM actualmente controla hpd_rx\\n    938                  * expl\u00edcitamente con dc_interrupt_set()\\n    939                  */\\n--\u003e 940                 if (dc_link-\u003eirq_source_hpd != DC_IRQ_SOURCE_INVALID) {\\n                            ^^^^^^^^^^^^^^^^^^^^^^^ Si es NULL, entonces tenemos problemas porque lo desreferenciamos aqu\u00ed.\\n\\n    941                         irq_type = dc_link-\u003eirq_source_hpd - DC_IRQ_SOURCE_HPD1;\\n    942                         /*\\n    943                          * PENDIENTE: Hay una discrepancia entre mode_info.num_hpd\\n    944                          * y lo que la BIOS informa como el n\u00famero de conectores con hpd\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c\",\"lessThan\":\"a490e4d3c9fed1e690c8de348416eea3a9f054ff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c\",\"lessThan\":\"226a40c06a183abaeb7529a4f54d6c203bd14407\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"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\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"6.19.4\",\"matchCriteriaId\":\"92951753-508C-4AD2-8C9B-2C63E988AEA0\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-01T13:43:55+00:00",
      "cve": "CVE-2026-46245",
      "id": "CVE-2026-46245",
      "initial_release_date": "2026-06-03T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amd/display: Fix dc_link NULL handling in HPD init",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46245.json",
      "version": "3"
    }
  }
}

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.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-46245 (GCVE-0-2026-46245)

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Related by attack behaviour