{"id":"CVE-2024-50117","state":"PUBLISHED","title":"drm/amd: Guard against bad data for ATIF ACPI method","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd: Guard against bad data for ATIF ACPI method\n\nIf a BIOS provides bad data in response to an ATIF method call\nthis causes a NULL pointer dereference in the caller.\n\n```\n? show_regs (arch/x86/kernel/dumpstack.c:478 (discriminator 1))\n? __die (arch/x86/kernel/dumpstack.c:423 arch/x86/kernel/dumpstack.c:434)\n? page_fault_oops (arch/x86/mm/fault.c:544 (discriminator 2) arch/x86/mm/fault.c:705 (discriminator 2))\n? do_user_addr_fault (arch/x86/mm/fault.c:440 (discriminator 1) arch/x86/mm/fault.c:1232 (discriminator 1))\n? acpi_ut_update_object_reference (drivers/acpi/acpica/utdelete.c:642)\n? exc_page_fault (arch/x86/mm/fault.c:1542)\n? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)\n? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:387 (discriminator 2)) amdgpu\n? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:386 (discriminator 1)) amdgpu\n```\n\nIt has been encountered on at least one system, so guard for it.\n\n(cherry picked from commit c9b7c809b89f24e9372a4e7f02d64c950b07fdee)","publishedAt":"2024-11-05T17:10:47.985Z","updatedAt":"2026-08-05T11:41:46.698Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"58556dcbd5606a5daccaee73b2130bc16b48e025","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"43b4fa6e0e238c6e2662f4fb61d9f51c2785fb1d","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"234682910971732cd4da96fd95946e296e486b38","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"6032287747f874b52dc8b9d7490e2799736e035f","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"cd67af3c1762de4c2483ae4dbdd98f9ea8fa56e3","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"975ede2a7bec52b5da1428829b3439667c8a234b","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"1d7175f9c57b1abf9ecfbdfd53ea760761f52ffe","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"bf58f03931fdcf7b3c45cb76ac13244477a60f44","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"4.19.323","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.285","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.229","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.170","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.115","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.59","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.11.6","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c"]}],"references":["https://git.kernel.org/stable/c/58556dcbd5606a5daccaee73b2130bc16b48e025","https://git.kernel.org/stable/c/43b4fa6e0e238c6e2662f4fb61d9f51c2785fb1d","https://git.kernel.org/stable/c/234682910971732cd4da96fd95946e296e486b38","https://git.kernel.org/stable/c/6032287747f874b52dc8b9d7490e2799736e035f","https://git.kernel.org/stable/c/cd67af3c1762de4c2483ae4dbdd98f9ea8fa56e3","https://git.kernel.org/stable/c/975ede2a7bec52b5da1428829b3439667c8a234b","https://git.kernel.org/stable/c/1d7175f9c57b1abf9ecfbdfd53ea760761f52ffe","https://git.kernel.org/stable/c/bf58f03931fdcf7b3c45cb76ac13244477a60f44","https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:07:56.516Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/50xxx/CVE-2024-50117.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-50117","state":"PUBLISHED","datePublished":"2024-11-05T17:10:47.985Z","dateUpdated":"2026-08-05T11:41:46.698Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-10-21T19:36:19.948Z"},"containers":{"cna":{"title":"drm/amd: Guard against bad data for ATIF ACPI method","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd: Guard against bad data for ATIF ACPI method\n\nIf a BIOS provides bad data in response to an ATIF method call\nthis causes a NULL pointer dereference in the caller.\n\n```\n? show_regs (arch/x86/kernel/dumpstack.c:478 (discriminator 1))\n? __die (arch/x86/kernel/dumpstack.c:423 arch/x86/kernel/dumpstack.c:434)\n? page_fault_oops (arch/x86/mm/fault.c:544 (discriminator 2) arch/x86/mm/fault.c:705 (discriminator 2))\n? do_user_addr_fault (arch/x86/mm/fault.c:440 (discriminator 1) arch/x86/mm/fault.c:1232 (discriminator 1))\n? acpi_ut_update_object_reference (drivers/acpi/acpica/utdelete.c:642)\n? exc_page_fault (arch/x86/mm/fault.c:1542)\n? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)\n? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:387 (discriminator 2)) amdgpu\n? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:386 (discriminator 1)) amdgpu\n```\n\nIt has been encountered on at least one system, so guard for it.\n\n(cherry picked from commit c9b7c809b89f24e9372a4e7f02d64c950b07fdee)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"58556dcbd5606a5daccaee73b2130bc16b48e025","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"43b4fa6e0e238c6e2662f4fb61d9f51c2785fb1d","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"234682910971732cd4da96fd95946e296e486b38","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"6032287747f874b52dc8b9d7490e2799736e035f","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"cd67af3c1762de4c2483ae4dbdd98f9ea8fa56e3","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"975ede2a7bec52b5da1428829b3439667c8a234b","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"1d7175f9c57b1abf9ecfbdfd53ea760761f52ffe","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"bf58f03931fdcf7b3c45cb76ac13244477a60f44","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"4.19.323","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.285","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.229","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.170","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.115","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.59","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.11.6","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/58556dcbd5606a5daccaee73b2130bc16b48e025"},{"url":"https://git.kernel.org/stable/c/43b4fa6e0e238c6e2662f4fb61d9f51c2785fb1d"},{"url":"https://git.kernel.org/stable/c/234682910971732cd4da96fd95946e296e486b38"},{"url":"https://git.kernel.org/stable/c/6032287747f874b52dc8b9d7490e2799736e035f"},{"url":"https://git.kernel.org/stable/c/cd67af3c1762de4c2483ae4dbdd98f9ea8fa56e3"},{"url":"https://git.kernel.org/stable/c/975ede2a7bec52b5da1428829b3439667c8a234b"},{"url":"https://git.kernel.org/stable/c/1d7175f9c57b1abf9ecfbdfd53ea760761f52ffe"},{"url":"https://git.kernel.org/stable/c/bf58f03931fdcf7b3c45cb76ac13244477a60f44"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","baseScore":7.3,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable `amdgpu_atif_call()` path is reached only from the local host — `amdgpu_acpi_detect()` at amdgpu module init and `amdgpu_acpi_event()`/`amdgpu_atif_handler()` on ACPI video notifications — with no network-facing component involved. Supplying a malformed ATIF return object is done through local software interfaces (initrd ACPI table override, acpi_configfs SSDT load, driver rebind), not physical access, so Local rather than Physical.\nAC:L - Once the ATIF method yields a non-buffer object, the missing type check is bypassed unconditionally and `info->buffer.pointer` is dereferenced deterministically on every probe — no race, no memory-layout luck, no timing window. This matches the sibling CVE-2024-53060 in the same function, also scored AC:L.\nPR:L - The oops occurs in the amdgpu probe/ACPI-notify path on an affected system with no capability check gating it, and the resulting kernel-memory disclosure surfaces to any unprivileged local user via `/sys/class/backlight/amdgpu_bl*/brightness`. Consistent with the CNA's scoring of the directly-related CVE-2024-53060 in this same function at PR:L.\nUI:N - The faulting ATIF calls fire autonomously during driver initialization and on firmware-generated ACPI video notify events; no victim must open a file, mount anything, or interact in any way.\nS:U - The type confusion, wild read, and crash all occur inside kernel memory within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - For an `ACPI_TYPE_INTEGER` return, `buffer.pointer` aliases `integer.value` exactly, so the driver reads `*(u16 *)` and then `memcpy()`s from a fully firmware-controlled arbitrary kernel address — an unbounded read primitive, not a read clamped to a few bytes. Part of that harvested memory (`ac_level`/`dc_level`) escapes the DM sanity clamp and is published to userspace as the initial backlight brightness.\nI:L - Bytes read out of bounds are written into persistent driver state (`atif->backlight_caps`, `notification_cfg.command_code`) and drive device behavior through `backlight_device_set_brightness()`, so kernel state is modified in an attacker-influenced way. It is not High because every `memcpy()` is length-clamped by `min(sizeof(dst), size)` into a fixed-size object, giving no out-of-bounds write or control-flow hijack primitive.\nA:H - Dereferencing the aliased firmware value produces the page-fault oops shown in the commit's backtrace, and because it happens in `amdgpu_acpi_detect()` during module init the box fails to bring up graphics on every boot — a reliably repeatable kernel crash."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T11:41:46.698Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"4.19.323"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.4.285"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.229"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.15.170"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.11.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2024-50117","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T20:21:49.660526Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T20:27:16.797Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T22:25:41.552Z"}}]}}}