{"id":"CVE-2026-63880","summary":"drm/amdgpu: fix lock leak on ENOMEM in AMDGPU_GEM_OP_GET_MAPPING_INFO","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix lock leak on ENOMEM in AMDGPU_GEM_OP_GET_MAPPING_INFO\n\nThe AMDGPU_GEM_OP_GET_MAPPING_INFO branch of amdgpu_gem_op_ioctl()\nholds three cleanup-tracked resources before calling kvcalloc():\nthe drm_gem_object reference from drm_gem_object_lookup(), the\ndrm_exec lock on the looked-up GEM via drm_exec_lock_obj(), and\nthe drm_exec lock on the per-process VM root page directory via\namdgpu_vm_lock_pd().  All three are released by the out_exec\nlabel that every other error path in this function jumps to.\nThe kvcalloc() failure path returns -ENOMEM directly, skipping\nout_exec and leaking all three.\n\nThe leaked per-process VM root PD dma_resv lock is the\nload-bearing leak: any subsequent operation on the same VM\n(further GEM ops, command-submission, eviction, TTM shrinker\ncallbacks) blocks on the held lock.  DRM_IOCTL_AMDGPU_GEM_OP is\nDRM_AUTH | DRM_RENDER_ALLOW, so this is an unprivileged-local\ndenial of service against the caller's GPU context, reachable\nby any process with /dev/dri/renderD* access.\n\nRoute the failure through out_exec so drm_exec_fini() and\ndrm_gem_object_put() run.\n\nReproduced on stock 7.0.0-10, Ryzen 7 5700U / Radeon Vega\n(Lucienne): the failing ioctl returns -ENOMEM and a second\nGET_MAPPING_INFO on the same fd then blocks in\ndrm_exec_lock_obj() on the leaked dma_resv.  SIGKILL on the\ncaller does not reap the task; the fd-release path during\nprocess exit goes through amdgpu_gem_object_close() -\u003e\ndrm_exec_prepare_obj() on the same lock, leaving the task in D\nstate until the box is rebooted.  The patched kernel was not\nrebuilt and re-tested on this hardware; the fix is mechanical.\nTested on a single Lucienne / Vega box only.\n\nZiyi Guo posted an independent INT_MAX-bound check for\nargs-\u003enum_entries in the same branch [1]; the two patches are\ncomplementary and can land in either order.\n\n(cherry picked from commit b69d3256d79de15f54c322986ff4da68f1d65b0a)","modified":"2026-07-21T03:47:31.637930728Z","published":"2026-07-19T14:54:52.397Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63880.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1eb86334e391695d4a40743b114afc15df4dc506"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2e7f55eb408c3f72ee1957a0d0ad11d8648a6379"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f643d534ffc6f1b6182e4f3acff8f04890504b9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63880.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63880"},{"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":"4d82724f7f2b847eb0454b1aab5450545b39abd4"},{"fixed":"1eb86334e391695d4a40743b114afc15df4dc506"},{"fixed":"8f643d534ffc6f1b6182e4f3acff8f04890504b9"},{"fixed":"2e7f55eb408c3f72ee1957a0d0ad11d8648a6379"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63880.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63880.json"}}],"schema_version":"1.7.5"}