{"id":"CVE-2026-98949","state":"PUBLISHED","title":"drm/imagination: Fix reference and vm_bo handling in remap()","description":"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->gpuvm_bo, the new object's\n  vm_bo:\n\n    prev_va --obj--> BO_A          BO_B <--obj-- vm_bo (ctx->gpuvm_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->obj)\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->remap.unmap->va->vm_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.","publishedAt":"2026-10-23T12:19:08.946Z","updatedAt":"2026-10-23T12:19:08.946Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"521cf8403a185a9d5790fe324bb43ba7ea85f51c","versionType":"git"},{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"9caa2eca5cc8372517ff36a83f321d4326abae93","versionType":"git"},{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"784356aa88b82035d70e9faeded49b70cddeb29e","versionType":"git"},{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"196d4d10c1b33ae176685ff42a9994a5952b1d0f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_vm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_vm.c"]}],"references":["https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c","https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93","https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e","https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98949.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98949","state":"PUBLISHED","datePublished":"2026-10-23T12:19:08.946Z","dateUpdated":"2026-10-23T12:19:08.946Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.382Z"},"containers":{"cna":{"title":"drm/imagination: Fix reference and vm_bo handling in remap()","descriptions":[{"lang":"en","value":"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->gpuvm_bo, the new object's\n  vm_bo:\n\n    prev_va --obj--> BO_A          BO_B <--obj-- vm_bo (ctx->gpuvm_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->obj)\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->remap.unmap->va->vm_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"521cf8403a185a9d5790fe324bb43ba7ea85f51c","versionType":"git"},{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"9caa2eca5cc8372517ff36a83f321d4326abae93","versionType":"git"},{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"784356aa88b82035d70e9faeded49b70cddeb29e","versionType":"git"},{"version":"ff5f643de0bf27874c4033cd57a0bd034b5c7d11","status":"affected","lessThan":"196d4d10c1b33ae176685ff42a9994a5952b1d0f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_vm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/imagination/pvr_vm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c"},{"url":"https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93"},{"url":"https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e"},{"url":"https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-23T12:19:08.946Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}