{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26914","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.193Z","datePublished":"2024-04-17T15:59:24.453Z","dateUpdated":"2026-08-05T11:28:17.004Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:28:17.004Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: fix incorrect mpc_combine array size\n\n[why]\nMAX_SURFACES is per stream, while MAX_PLANES is per asic. The\nmpc_combine is an array that records all the planes per asic. Therefore\nMAX_PLANES should be used as the array size. Using MAX_SURFACES causes\narray overflow when there are more than 3 planes.\n\n[how]\nUse the MAX_PLANES for the mpc_combine array size."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The overflow is reached only through the local DRM atomic modeset ioctl (`DRM_IOCTL_MODE_ATOMIC`) on /dev/dri/cardN, which drives `amdgpu_dm_atomic_check()` → `dc_validate_global_state()` → `dcn32_internal_validate_bw()`. No network or remote data path reaches `dcn32_fpu.c`.\nAC:L - On an affected DCN3.2/3.2.1 ASIC the attacker fully controls the trigger — assigning four planes (two primaries plus two MPO overlays) across two CRTCs in a single atomic commit, even a TEST_ONLY one, deterministically pushes `mpc_combine_count` past the 3-entry array. No race, no timing window, no unpredictable memory layout is required.\nPR:L - The atomic ioctl requires DRM master, which an ordinary unprivileged user holds for their own graphical session (or obtains by opening the card first on a kiosk/embedded/automotive system with no running compositor); no root or capability in the init namespace is needed.\nUI:N - The attacker performs the entire sequence — configuring planes and issuing the atomic commit/test — from their own process; no other user must open a file, plug in hardware, or take any action.\nS:U - The corruption occurs in the kernel stack frame of the amdgpu display driver and stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Clobbering `mpc_combine_count` with the low bits of a kernel pointer makes `update_pipes_with_slice_table()` and `update_slice_table_for_plane()` read hundreds of megabytes worth of out-of-bounds indices off the kernel stack and treat that data as `dc_plane_state`/`pipe_ctx` pointers, giving an out-of-bounds read primitive over kernel memory; per kernel CVSS guidance, memory corruption of this class is scored High.\nI:H - This is an out-of-bounds stack write: kernel pointer values are written past the end of `struct pipe_slice_table`, and the corrupted count subsequently allows an append at an attacker-uninfluenced-but-huge index, producing a wild write plus `slice_count += diff` increments at out-of-bounds addresses — an exploitable memory-corruption primitive.\nA:H - Once the count is corrupted into a multi-million value, the driver dereferences garbage pointers inside a `DC_FP_START()`/kernel_fpu section while holding the DC lock, which reliably produces an oops/panic and takes down the display pipeline."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c"],"versions":[{"version":"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c","lessThan":"0bd8ef618a42d7e6ea3f701065264e15678025e3","status":"affected","versionType":"git"},{"version":"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c","lessThan":"39079fe8e660851abbafa90cd55cbf029210661f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c"],"versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","status":"unaffected","versionType":"semver"},{"version":"6.7.6","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.7.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3"},{"url":"https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f"}],"title":"drm/amd/display: fix incorrect mpc_combine array size","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T00:21:05.456Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-26914","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:47:53.436948Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:32:51.667Z"}}]}}