{"id":"CVE-2026-68272","summary":"drm/amdgpu: validate CP_GFX_SHADOW chunk size in CS pass1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: validate CP_GFX_SHADOW chunk size in CS pass1\n\nAdd a minimum-length check for the AMDGPU_CHUNK_ID_CP_GFX_SHADOW chunk in\namdgpu_cs_pass1(), matching the gate already present for the IB, FENCE and\nBO_HANDLES chunk types.\n\nThe CP_GFX_SHADOW case previously shared a bare break with the dependency\nand syncobj chunk types, which do not dereference a fixed-size struct. When\nuserspace submits this chunk with length_dw == 0, vmemdup_array_user() is\ncalled with size 0 and returns ZERO_SIZE_PTR, which passes the IS_ERR()\ncheck. amdgpu_cs_p2_shadow() then dereferences chunk-\u003ekdata as a struct\ndrm_amdgpu_cs_chunk_cp_gfx_shadow (reading shadow-\u003eflags), faulting on the\nZERO_SIZE_PTR and causing a NULL-pointer dereference.\n\nThis is reachable by an unprivileged process in the render group. Reject\nundersized chunks with -EINVAL during pass1 so the bad submission is\nrejected before pass2 ever dereferences the data.\n\n(cherry picked from commit 7f61b2eef7415eccdb40850aca0de94211948657)","modified":"2026-08-12T04:18:47.289872620Z","published":"2026-08-10T12:01:47.708Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68272.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/24668ca3ec19434d7a9574bf9112f2b0614c3a4e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2aa9ea2bd5146d237c8cc16d8737d878b0298a94"},{"type":"WEB","url":"https://git.kernel.org/stable/c/315d2e5741a81b0be763e80413a2677e22b7e596"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f190956404da55560056ce20606010e18bc059c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84c4c36acd5c4b2558b5069f869a165b2c655c84"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68272.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68272"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ac9287055ff16a092416c76a19006764e4c6a978"},{"fixed":"3f190956404da55560056ce20606010e18bc059c"},{"fixed":"2aa9ea2bd5146d237c8cc16d8737d878b0298a94"},{"fixed":"315d2e5741a81b0be763e80413a2677e22b7e596"},{"fixed":"24668ca3ec19434d7a9574bf9112f2b0614c3a4e"},{"fixed":"84c4c36acd5c4b2558b5069f869a165b2c655c84"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68272.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.5.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68272.json"}}],"schema_version":"1.9.0"}