FKIE_CVE-2026-46245
Vulnerability from fkie_nvd - Published: 2026-06-03 18:16 - Updated: 2026-07-22 20:10
Severity
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
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"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",
"vendor": "Linux",
"versions": [
{
"lessThan": "a490e4d3c9fed1e690c8de348416eea3a9f054ff",
"status": "affected",
"version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
"versionType": "git"
},
{
"lessThan": "226a40c06a183abaeb7529a4f54d6c203bd14407",
"status": "affected",
"version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"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",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.15"
},
{
"lessThan": "4.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "92951753-508C-4AD2-8C9B-2C63E988AEA0",
"versionEndExcluding": "6.19.4",
"versionStartIncluding": "4.15",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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"
}
],
"id": "CVE-2026-46245",
"lastModified": "2026-07-22T20:10:00.127",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2026-06-03T18:16:24.637",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date | Other |
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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