{"id":"CVE-2026-43318","summary":"drm/amdgpu: fix sync handling in amdgpu_dma_buf_move_notify","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix sync handling in amdgpu_dma_buf_move_notify\n\nInvalidating a dmabuf will impact other users of the shared BO.\nIn the scenario where process A moves the BO, it needs to inform\nprocess B about the move and process B will need to update its\npage table.\n\nThe commit fixes a synchronisation bug caused by the use of the\nticket: it made amdgpu_vm_handle_moved behave as if updating\nthe page table immediately was correct but in this case it's not.\n\nAn example is the following scenario, with 2 GPUs and glxgears\nrunning on GPU0 and Xorg running on GPU1, on a system where P2P\nPCI isn't supported:\n\nglxgears:\n  export linear buffer from GPU0 and import using GPU1\n  submit frame rendering to GPU0\n  submit tiled-\u003elinear blit\nXorg:\n  copy of linear buffer\n\nThe sequence of jobs would be:\n  drm_sched_job_run                       # GPU0, frame rendering\n  drm_sched_job_queue                     # GPU0, blit\n  drm_sched_job_done                      # GPU0, frame rendering\n  drm_sched_job_run                       # GPU0, blit\n  move linear buffer for GPU1 access      #\n  amdgpu_dma_buf_move_notify -\u003e update pt # GPU0\n\nIt this point the blit job on GPU0 is still running and would\nlikely produce a page fault.","modified":"2026-06-18T03:56:09.520168540Z","published":"2026-05-08T13:26:13.557Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43318.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3307459eb3583115264421e859858d1f90f3694a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82a7ea35a1526bef8ae170c33ff80e5db7728961"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89a9389ad70d3c69538e59d87df67d407aef4c26"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b18fc0ab837381c1a6ef28386602cd888f2d9edf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43318.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43318"},{"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":"a448cb003edcb4b63d0a9c95f3faab724e6150fb"},{"fixed":"82a7ea35a1526bef8ae170c33ff80e5db7728961"},{"fixed":"89a9389ad70d3c69538e59d87df67d407aef4c26"},{"fixed":"3307459eb3583115264421e859858d1f90f3694a"},{"fixed":"b18fc0ab837381c1a6ef28386602cd888f2d9edf"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43318.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43318.json"}}],"schema_version":"1.7.5"}