{"id":"CVE-2026-68106","state":"PUBLISHED","title":"drm/amdgpu: fix division by zero with invalid uvd dimensions","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix division by zero with invalid uvd dimensions\n\nWhen width or height is less than 16, width_in_mb or height_in_mb\nbecomes 0, leading to fs_in_mb being 0. This causes a division by\nzero when calculating num_dpb_buffer in H264 and H264 Perf decode\npaths.\n\nAdd validation to reject frames with width < 16 or height < 16\nbefore performing any calculations that depend on these values.\n\nV2: Format change - move up all vaiable definitions.\nV3: Use warn_once to avoid spam.\n\n(cherry picked from commit 3e41d26c70b0a459d041cc19482a226c4b7423cb)","publishedAt":"2026-08-10T11:58:23.108Z","updatedAt":"2026-10-19T20:58:50.821Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"004d0453cfef16f056cb7b8bc04f69f19cf9df32","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"00ee64910ecf748cc15b23bbcbea472c203ec1e8","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"81c9b4921f62d1642b9d775524ae9240e521a5ed","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"52f9a588296432accf2982f7d258192a37562f4f","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"a00946b5ab7c25da5685ca9c58f50ff6f43c0fdf","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"ffb33d466a68cea3e8a3dbed04d79037a3cbabd1","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"be725ab23aa45c11a5afef3e2a9f6d8c084ae5dc","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"0c01c811be47e6b146552dd59bfedbea8f09b8f4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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_uvd.c"]}],"references":["https://git.kernel.org/stable/c/004d0453cfef16f056cb7b8bc04f69f19cf9df32","https://git.kernel.org/stable/c/00ee64910ecf748cc15b23bbcbea472c203ec1e8","https://git.kernel.org/stable/c/81c9b4921f62d1642b9d775524ae9240e521a5ed","https://git.kernel.org/stable/c/52f9a588296432accf2982f7d258192a37562f4f","https://git.kernel.org/stable/c/a00946b5ab7c25da5685ca9c58f50ff6f43c0fdf","https://git.kernel.org/stable/c/ffb33d466a68cea3e8a3dbed04d79037a3cbabd1","https://git.kernel.org/stable/c/be725ab23aa45c11a5afef3e2a9f6d8c084ae5dc","https://git.kernel.org/stable/c/0c01c811be47e6b146552dd59bfedbea8f09b8f4"],"weaknesses":["CWE-369"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68106.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68106","state":"PUBLISHED","datePublished":"2026-08-10T11:58:23.108Z","dateUpdated":"2026-10-19T20:58:50.821Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.368Z"},"containers":{"cna":{"title":"drm/amdgpu: fix division by zero with invalid uvd dimensions","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix division by zero with invalid uvd dimensions\n\nWhen width or height is less than 16, width_in_mb or height_in_mb\nbecomes 0, leading to fs_in_mb being 0. This causes a division by\nzero when calculating num_dpb_buffer in H264 and H264 Perf decode\npaths.\n\nAdd validation to reject frames with width < 16 or height < 16\nbefore performing any calculations that depend on these values.\n\nV2: Format change - move up all vaiable definitions.\nV3: Use warn_once to avoid spam.\n\n(cherry picked from commit 3e41d26c70b0a459d041cc19482a226c4b7423cb)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"004d0453cfef16f056cb7b8bc04f69f19cf9df32","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"00ee64910ecf748cc15b23bbcbea472c203ec1e8","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"81c9b4921f62d1642b9d775524ae9240e521a5ed","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"52f9a588296432accf2982f7d258192a37562f4f","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"a00946b5ab7c25da5685ca9c58f50ff6f43c0fdf","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"ffb33d466a68cea3e8a3dbed04d79037a3cbabd1","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"be725ab23aa45c11a5afef3e2a9f6d8c084ae5dc","versionType":"git"},{"version":"d38ceaf99ed015f2a0b9af3499791bd3a3daae21","status":"affected","lessThan":"0c01c811be47e6b146552dd59bfedbea8f09b8f4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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_uvd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/004d0453cfef16f056cb7b8bc04f69f19cf9df32"},{"url":"https://git.kernel.org/stable/c/00ee64910ecf748cc15b23bbcbea472c203ec1e8"},{"url":"https://git.kernel.org/stable/c/81c9b4921f62d1642b9d775524ae9240e521a5ed"},{"url":"https://git.kernel.org/stable/c/52f9a588296432accf2982f7d258192a37562f4f"},{"url":"https://git.kernel.org/stable/c/a00946b5ab7c25da5685ca9c58f50ff6f43c0fdf"},{"url":"https://git.kernel.org/stable/c/ffb33d466a68cea3e8a3dbed04d79037a3cbabd1"},{"url":"https://git.kernel.org/stable/c/be725ab23aa45c11a5afef3e2a9f6d8c084ae5dc"},{"url":"https://git.kernel.org/stable/c/0c01c811be47e6b146552dd59bfedbea8f09b8f4"}],"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 flaw is reached only via the AMDGPU_CS DRM ioctl on a local render node (/dev/dri/renderD*), traversing amdgpu_cs_ioctl, amdgpu_cs_patch_ibs, amdgpu_uvd_ring_parse_cs, and amdgpu_uvd_cs_msg_decode; it is not reachable from any network-facing kernel service.\nAC:L - An attacker with render-node access fully controls the UVD decode message fields (stream_type H264/H264 Perf, width, height, level) in their own BO and can reliably trigger width or height < 16 after creating a valid UVD session handle.\nPR:L - Exploitation requires only standard unprivileged local access to the AMDGPU DRM render node (DRM_AUTH|DRM_RENDER_ALLOW on AMDGPU_CS), not root or capabilities outside the render/video group; user namespaces do not grant this access by themselves.\nUI:N - No victim interaction is required; a local attacker can directly submit a crafted UVD command stream through AMDGPU_CS ioctl without needing another user to open media, mount a filesystem, or take any other action.\nS:U - Impact is confined to the kernel/GPU driver security domain on the local host (kernel oops or GPU memory corruption within the attacker's DRM client); it does not cross VM, IOMMU, or sandbox boundaries to affect a different security authority.\nC:H - On x86, kernel-mode divide-by-zero causes a fatal trap; on architectures where unsigned division by zero returns zero, underestimated DPB buffer sizes can pass validation, enabling GPU out-of-bounds reads of adjacent mapped buffers that may hold sensitive data.\nI:H - Underestimated buffer-size calculations from zero macroblock counts can let undersized DPB buffers pass kernel validation, permitting the UVD engine to perform out-of-bounds writes into adjacent GPU-mapped memory that could be leveraged for further memory corruption.\nA:H - Triggering the divide-by-zero in kernel context during CS parsing causes an x86 divide-error exception leading to die()/kernel oops, crashing or hanging the system; repeated submissions can deny GPU/video availability on affected UVD hardware (v3.1-v6.0)."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:29:19.954Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-68106","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:43:55.237133Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-369","lang":"en","type":"CWE","description":"CWE-369 Divide By Zero"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:58:50.821Z"}}]}}}