{"id":"CVE-2026-98949","summary":"drm/imagination: Fix reference and vm_bo handling in remap()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: Fix reference and vm_bo handling in remap()\n\nWhen a map overlaps part of an existing mapping, pvr_vm_gpuva_remap()\nsplits the mapping into prev/next parts covering what the request did\nnot take, instead of creating something new. It gets two things wrong.\n\n- A GEM reference is taken for each part but it's never needed and never\n  dropped, so it leaks one reference per split (remap-next-in-2m in\n  tests/imagination/pvr_vm_map.c):\n\n    CRITICAL: 33558528 bytes of shmem still held after close\n\n- The parts still belong to the original object being split, but\n  pvr_vm_gpuva_remap() links them to ctx-\u003egpuvm_bo, the new object's\n  vm_bo:\n\n    prev_va --obj--\u003e BO_A          BO_B \u003c--obj-- vm_bo (ctx-\u003egpuvm_bo)\n            \\___________link___________/  (mismatch: BO_A != BO_B)\n\n  drm_gpuva_link() catches the mismatch:\n\n    WARNING: drivers/gpu/drm/drm_gpuvm.c:2108 at drm_gpuva_link+0x2ec/0x310\n      drm_WARN_ON(obj != vm_bo-\u003eobj)\n    Call trace:\n     drm_gpuva_link\n     pvr_vm_gpuva_remap\n     __drm_gpuvm_sm_map\n     pvr_vm_map\n     pvr_ioctl_vm_map\n\n  Link them to op-\u003eremap.unmap-\u003eva-\u003evm_bo instead.\n\nThe locking of the GPUVA lists of the other objects touched by a split is\nnot addressed here; it is handled by switching the GPUVM to immediate\nmode.","modified":"2026-11-04T14:27:22.445124701Z","published":"2026-10-23T12:19:08.946Z","related":["SUSE-SU-2026:5091-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98949.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98949.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98949"},{"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":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11"},{"fixed":"521cf8403a185a9d5790fe324bb43ba7ea85f51c"},{"fixed":"9caa2eca5cc8372517ff36a83f321d4326abae93"},{"fixed":"784356aa88b82035d70e9faeded49b70cddeb29e"},{"fixed":"196d4d10c1b33ae176685ff42a9994a5952b1d0f"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98949.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.8.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98949.json"}}],"schema_version":"1.9.2"}