161 lines
8.7 KiB
JSON
161 lines
8.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40354",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.187Z",
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"datePublished": "2025-12-16T13:30:27.082Z",
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"dateUpdated": "2026-08-05T12:09:51.348Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:09:51.348Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: increase max link count and fix link->enc NULL pointer access\n\n[why]\n1.) dc->links[MAX_LINKS] array size smaller than actual requested.\nmax_connector + max_dpia + 4 virtual = 14.\nincrease from 12 to 14.\n\n2.) hw_init() access null LINK_ENC for dpia non display_endpoint.\n\n(cherry picked from commit d7f5a61e1b04ed87b008c8d327649d184dc5bb45)"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The defect is in the amdgpu DC display driver's hardware-init path, reached through local driver probe and suspend/resume (including runtime-PM resume driven by opening /dev/dri/renderD*). There is no network-facing component.\nAC:L - Both the unbounded `dc->links[]` append in create_links() and the NULL `link->link_enc` dereference for DPIA endpoints are deterministic on affected DCN4x configurations — no race to win and no memory layout beyond the attacker's influence.\nPR:L - The vulnerable init_hw path is re-entered on every runtime-PM/system resume via dm_resume() -> dc_set_power_state(D0), which an unprivileged local user holding an ordinary DRM/render node handle can drive repeatedly; no root or CAP_SYS_ADMIN is required.\nUI:N - No victim action is needed — the corrupting create_links() loop runs at driver init and the NULL dereference is hit automatically on each hardware init/resume cycle.\nS:U - The out-of-bounds write and NULL dereference stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Overflowing dc->links[] overwrites the adjacent `struct link_service *link_srv`, `current_state`, and `res_pool` pointers in struct dc, so subsequent dc->link_srv->...() dispatches read from an attacker-influenceable heap object, yielding pointer confusion and arbitrary kernel-memory read primitives.\nI:H - This is an out-of-bounds write of pointer values past a fixed array directly onto a function-pointer-table pointer (link_srv), giving a realistic indirect-call hijack and arbitrary write path rather than a bounded corruption.\nA:H - The unfixed DPIA path dereferences a NULL link->link_enc in dcn401_init_hw(), producing a kernel oops on every hardware init/resume, and the adjacent-field corruption reliably panics the machine."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c",
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"drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h"
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],
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"versions": [
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{
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"version": "4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c",
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"lessThan": "f28092be4e12b7df9e4f415d25bf0d767bc2d9ed",
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"status": "affected",
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"versionType": "git"
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},
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{
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"status": "affected",
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}
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},
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{
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c",
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"drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h"
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],
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"versions": [
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{
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"version": "4.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.56",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.6",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.15",
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"versionEndExcluding": "6.12.56"
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{
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f28092be4e12b7df9e4f415d25bf0d767bc2d9ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3fc0d36cfb927f8986b83bf5fba47dbedad3c63"
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},
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{
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"url": "https://git.kernel.org/stable/c/bec947cbe9a65783adb475a5fb47980d7b4f4796"
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}
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],
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"title": "drm/amd/display: increase max link count and fix link->enc NULL pointer access",
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