{"id":"CVE-2026-99209","title":"drm/xe: skip eviction of a BO with no resource","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: skip eviction of a BO with no resource\n\nxe_evict_flags() switches on tbo->resource->mem_type to choose an\neviction placement. An xe BO can reach eviction with n…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= dd08ebf6c3525a7ea2186e636df064ea47281987 < 6046bb9cb2859e3d9bf939e4d6527f3827e1096f","Linux >= dd08ebf6c3525a7ea2186e636df064ea47281987 < b6499d19ade1f1e4a1e6b739abc8c815297c98b8","Linux >= dd08ebf6c3525a7ea2186e636df064ea47281987 < 448e76cbdc6652ccd3ba337b7a6e1f028859f2ed","Linux 6.8"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:36:03.274Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99209","references":[{"url":"https://git.kernel.org/stable/c/6046bb9cb2859e3d9bf939e4d6527f3827e1096f"},{"url":"https://git.kernel.org/stable/c/b6499d19ade1f1e4a1e6b739abc8c815297c98b8"},{"url":"https://git.kernel.org/stable/c/448e76cbdc6652ccd3ba337b7a6e1f028859f2ed"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.358Z","slug":"CVE-2026-99209","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: skip eviction of a BO with no resource\n\nxe_evict_flags() switches on tbo->resource->mem_type to choose an\neviction placement. An xe BO can reach eviction with no ttm.resource,\ne.g. an imported dma-buf BO whose resource was freed during teardown\nwhile its attachment is still live: the exporter then invalidates it via\nxe_dma_buf_move_notify() -> xe_bo_evict(), and the switch dereferences a\nNULL resource and faults.\n\nA BO with no resource has nothing placed or mapped, so there is nothing\nto evict. Return an empty placement (num_placement = 0), mirroring the\nhandling already used for non-xe scatter-gather BOs just above;\nttm_bo_validate() then takes the pipeline-gutting path and returns 0.\n\nWithout the fix the xe_dma_buf@xe_test_dmabuf_move_notify_no_resource\ndynamic live selftest will fail with below stack.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nRIP: 0010:xe_evict_flags+0xf4/0x140 [xe]\nCall Trace:\n <TASK>\n xe_bo_evict+0x40/0xa0 [xe]\n ? ttm_bo_pipeline_gutting+0x71/0x180 [ttm]\n xe_test_dmabuf_move_notify_no_resource+0x182/0x440 [xe]\n xe_dma_buf_kunit+0x387/0x580 [xe]\n\nv2: Add Fixes tag and failure info in commit text (Matt Brost)\n\n(cherry picked from commit dbcfaac6331f1fcb0c2fe3ad3e9adb1e5d43ec0c)\n\n## Affected\n\n- `Linux >= dd08ebf6c3525a7ea2186e636df064ea47281987 < 6046bb9cb2859e3d9bf939e4d6527f3827e1096f`\n- `Linux >= dd08ebf6c3525a7ea2186e636df064ea47281987 < b6499d19ade1f1e4a1e6b739abc8c815297c98b8`\n- `Linux >= dd08ebf6c3525a7ea2186e636df064ea47281987 < 448e76cbdc6652ccd3ba337b7a6e1f028859f2ed`\n- `Linux 6.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}