{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98517", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.354Z", "datePublished": "2026-10-18T15:17:35.521Z", "dateUpdated": "2026-10-24T14:09:14.724Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:09:14.724Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM\n\nnouveau_uvmm_sm() calls op_map(), which passes bo->resource through\nnouveau_mem() to nouveau_uvma_map(). nouveau_uvmm_vmm_map() then reads\nmem->mem.type.\n\nBut this is only valid when bo->resource is backed by struct nouveau_mem,\nas is the case for VRAM and TT resources. If the BO is left in\nTTM_PL_SYSTEM, bo->resource is only a struct ttm_resource. Treating it\nas struct nouveau_mem makes the mem->mem.type read past the end of the\nresource, causing a KASAN: slab-use-after-free Read in nouveau_uvmm_sm\nreport:\n\nBUG: KASAN: slab-use-after-free in nouveau_uvmm_vmm_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:152 [inline]\nBUG: KASAN: slab-use-after-free in nouveau_uvma_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:199 [inline]\nBUG: KASAN: slab-use-after-free in op_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:849 [inline]\nBUG: KASAN: slab-use-after-free in nouveau_uvmm_sm.constprop.0+0x6ab/0x900 drivers/gpu/drm/nouveau/nouveau_uvmm.c:903\nRead of size 1 at addr ffff888127d3e3a0 by task kworker/0:1/11\n\nCPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.2.0 #5 PREEMPT(lazy)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nWorkqueue: nouveau_sched_wq_2224 drm_sched_run_job_work\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x95/0xe0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xcb/0x5a0 mm/kasan/report.c:482\n kasan_report+0xca/0x100 mm/kasan/report.c:595\n nouveau_uvmm_vmm_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:152 [inline]\n nouveau_uvma_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:199 [inline]\n op_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:849 [inline]\n nouveau_uvmm_sm.constprop.0+0x6ab/0x900 drivers/gpu/drm/nouveau/nouveau_uvmm.c:903\n nouveau_uvmm_sm_unmap drivers/gpu/drm/nouveau/nouveau_uvmm.c:932 [inline]\n nouveau_uvmm_bind_job_run+0xd6/0x250 drivers/gpu/drm/nouveau/nouveau_uvmm.c:1532\n nouveau_job_run drivers/gpu/drm/nouveau/nouveau_sched.c:350 [inline]\n nouveau_sched_run_job+0x62/0xd0 drivers/gpu/drm/nouveau/nouveau_sched.c:364\n drm_sched_run_job_work+0x356/0xa10 drivers/gpu/drm/scheduler/sched_main.c:1061\n process_one_work+0x8a5/0x1900 kernel/workqueue.c:3322\n process_scheduled_works kernel/workqueue.c:3405 [inline]\n worker_thread+0x5dd/0xd80 kernel/workqueue.c:3486\n kthread+0x31d/0x420 kernel/kthread.c:436\n ret_from_fork+0x662/0x940 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \n\nAllocated by task 2224 on cpu 0 at 66.550027s:\n kasan_save_stack+0x24/0x50 mm/kasan/common.c:57\n kasan_save_track+0x17/0x60 mm/kasan/common.c:78\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\n __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415\n kasan_kmalloc include/linux/kasan.h:263 [inline]\n __do_kmalloc_node mm/slub.c:5334 [inline]\n __kmalloc_noprof+0x304/0x7c0 mm/slub.c:5359\n _kmalloc_noprof include/linux/slab.h:992 [inline]\n dma_resv_list_alloc+0x27/0x90 drivers/dma-buf/dma-resv.c:106\n dma_resv_reserve_fences+0x60e/0xa30 drivers/dma-buf/dma-resv.c:205\n ttm_bo_alloc_resource+0x12c/0xbd0 drivers/gpu/drm/ttm/ttm_bo.c:721\n ttm_bo_validate+0x1bc/0x4a0 drivers/gpu/drm/ttm/ttm_bo.c:856\n ttm_bo_init_reserved+0x2c3/0x570 drivers/gpu/drm/ttm/ttm_bo.c:970\n nouveau_bo_init+0x159/0x2c0 drivers/gpu/drm/nouveau/nouveau_bo.c:359\n nouveau_gem_new+0x234/0x5f0 drivers/gpu/drm/nouveau/nouveau_gem.c:272\n nouveau_gem_ioctl_new+0x1eb/0x420 drivers/gpu/drm/nouveau/nouveau_gem.c:352\n drm_ioctl_kernel+0x192/0x350 drivers/gpu/drm/drm_ioctl.c:817\n drm_ioctl+0x4f8/0xb40 drivers/gpu/drm/drm_ioctl.c:914\n nouveau_drm_ioctl+0xea/0x2c0 drivers/gpu/drm/nouveau/nouveau_drm.c:1338\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x180/0x1d0 fs/ioctl.c:583\n do_syscall_x64 ar\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - DRM_IOCTL_NOUVEAU_VM_BIND reaches the patched nouveau_uvmm_sm() through nouveau_uvmm_ioctl_vm_bind() → nouveau_job_submit() → nouveau_uvmm_bind_job_run() → op_map(). The triggering CPU-only BO is created through local DRM_IOCTL_NOUVEAU_GEM_NEW, not supplied over a network or physical link.\nAC:L - After VM_INIT, the same client can create a CPU-only BO that nouveau_gem_new() leaves in TTM_PL_SYSTEM and submit a MAP operation; bind_lock_validate() preserves that placement and op_map() deterministically miscasts it. No race or condition outside the attacker's control is required.\nPR:L - NOUVEAU_VM_INIT, NOUVEAU_GEM_NEW, and NOUVEAU_VM_BIND are registered with DRM_RENDER_ALLOW and no DRM_ROOT_ONLY, DRM_AUTH, or capability check. An unprivileged local user able to open the nouveau render node can execute the complete sequence.\nUI:N - The attacker opens their own render-node fd and personally issues VM_INIT, GEM_NEW, and VM_BIND. No separate victim must mount media, open a file, or perform another action.\nS:U - The invalid struct nouveau_mem access occurs within the host nouveau driver and affects memory governed by the same kernel authority. It does not inherently cross a VM, IOMMU, or other security boundary.\nC:H - nouveau_uvmm_vmm_map() reads mem->mem.type from freed slab memory after op_map() treats a shorter TTM_PL_SYSTEM struct ttm_resource as struct nouveau_mem. This attacker-triggerable kernel UAF permits controlled slab reuse and a high-impact kernel-memory disclosure primitive.\nI:H - op_map() passes the falsely downcast resource onward to nvif_vmm_raw_map() as an nvif_mem, allowing reclaimed slab state to influence GPU mapping operations. The resulting kernel UAF/type confusion supports arbitrary writes or control-flow hijacking through heap grooming.\nA:H - KASAN confirmed the slab-use-after-free read in nouveau_uvmm_vmm_map() from the DRM scheduler workqueue. Repeated CPU-only BO mappings can dereference invalid freed-object state and cause a kernel oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/nouveau/nouveau_uvmm.c" ], "versions": [ { "version": "b88baab828713ce0b49b185444b2ee83bed373a8", "lessThan": "34d9dffaf0ff43ac395a7955b3f7b5d9d6154bf3", "status": "affected", "versionType": "git" }, { "version": "b88baab828713ce0b49b185444b2ee83bed373a8", "lessThan": "1245b4b43da67596be61600dbd746539c79495ac", "status": "affected", "versionType": "git" }, { "version": "b88baab828713ce0b49b185444b2ee83bed373a8", "lessThan": "0d29bf51f8dddcf8556bf76710d3dd3024a1a717", "status": "affected", "versionType": "git" }, { "version": "b88baab828713ce0b49b185444b2ee83bed373a8", "lessThan": "5b2fffbba290ed74f381911b9986570bc10feaa4", "status": "affected", "versionType": "git" }, { "version": "b88baab828713ce0b49b185444b2ee83bed373a8", "lessThan": "3359a372efb6d585c97019ee1b7f1874442bcebe", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/nouveau/nouveau_uvmm.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/34d9dffaf0ff43ac395a7955b3f7b5d9d6154bf3" }, { "url": "https://git.kernel.org/stable/c/1245b4b43da67596be61600dbd746539c79495ac" }, { "url": "https://git.kernel.org/stable/c/0d29bf51f8dddcf8556bf76710d3dd3024a1a717" }, { "url": "https://git.kernel.org/stable/c/5b2fffbba290ed74f381911b9986570bc10feaa4" }, { "url": "https://git.kernel.org/stable/c/3359a372efb6d585c97019ee1b7f1874442bcebe" } ], "title": "drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM", "x_generator": { "engine": "bippy-1.2.0" } } } }