GHSA-GC8H-W3QG-MPCQ
Vulnerability from github – Published: 2026-06-03 18:33 – Updated: 2026-06-09 21:32In 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
{
"affected": [],
"aliases": [
"CVE-2026-46245"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-03T18:16:24Z",
"severity": "MODERATE"
},
"details": "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",
"id": "GHSA-gc8h-w3qg-mpcq",
"modified": "2026-06-09T21:32:20Z",
"published": "2026-06-03T18:33:12Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46245"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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