--- id: CVE-2026-98515 title: 'drm/nouveau: fix double-free in nvif_vmm_dtor' summary: |- In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix double-free in nvif_vmm_dtor On failure, nouveau_cli_init() calls nouveau_cli_fini() to tear the client down. Then, nouveau_drm_open() also enters int… severity: none vendor: Linux product: Linux affected: - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 023e7a01f8fb27799f0987b5bcda325d73a2904c - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 375901ac0f286e81be00a4126e57d488cb401884 - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < bf542ecd4f60d4689818d194e7ca74772fe0f8b5 - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < f09f4a536935b15539f2de9fe775a2641202be90 - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 279e5ac137370e274a09dd552547ae6bddd0d4d5 - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 109a8d2d5b7d2719ebe09df3f9241023900b3846 - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 872a5473c02a26c955be44d52b7ab2f8ea70a2cf - >- Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 97077ac87afe9e91ec074ef0be64454e7ccbf344 - Linux 4.11 published: '2026-10-18' updated: '2026-10-18' sourceUpdated: '2026-10-18T15:17:31.953Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98515' references: - url: 'https://git.kernel.org/stable/c/023e7a01f8fb27799f0987b5bcda325d73a2904c' - url: 'https://git.kernel.org/stable/c/375901ac0f286e81be00a4126e57d488cb401884' - url: 'https://git.kernel.org/stable/c/bf542ecd4f60d4689818d194e7ca74772fe0f8b5' - url: 'https://git.kernel.org/stable/c/f09f4a536935b15539f2de9fe775a2641202be90' - url: 'https://git.kernel.org/stable/c/279e5ac137370e274a09dd552547ae6bddd0d4d5' - url: 'https://git.kernel.org/stable/c/109a8d2d5b7d2719ebe09df3f9241023900b3846' - url: 'https://git.kernel.org/stable/c/872a5473c02a26c955be44d52b7ab2f8ea70a2cf' - url: 'https://git.kernel.org/stable/c/97077ac87afe9e91ec074ef0be64454e7ccbf344' tags: - cve.org ingestedAt: '2026-10-18T15:45:12.284Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix double-free in nvif_vmm_dtor On failure, nouveau_cli_init() calls nouveau_cli_fini() to tear the client down. Then, nouveau_drm_open() also enters into its cleanup path and calls nouveau_cli_fini() AGAIN. nouveau_cli_fini() calls nouveau_vmm_fini(): void nouveau_vmm_fini(struct nouveau_vmm *vmm) { nouveau_svmm_fini(&vmm->svmm); nvif_vmm_dtor(&vmm->vmm); vmm->cli = NULL; } Inside nvif_vmm_dtor(), vmm->page is freed unconditionally: void nvif_vmm_dtor(struct nvif_vmm *vmm) { kfree(vmm->page); nvif_object_dtor(&vmm->object); } vmm->page is never cleared after being freed, so the second call of nvif_vmm_dtor() will cause a double-free. Found by fuzzing the nouveau driver with a modified Syzkaller: BUG: KASAN: double-free in nvif_vmm_dtor+0x31/0x50 drivers/gpu/drm/nouveau/nvif/vmm.c:194 Free of addr ffff888010fcdc30 by task syz.0.173/2567 CPU: 1 UID: 0 PID: 2567 Comm: syz.0.173 Not tainted 7.2.0 #24 PREEMPT(lazy) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x95/0xe0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcb/0x5a0 mm/kasan/report.c:482 kasan_report_invalid_free+0xaa/0xd0 mm/kasan/report.c:557 check_slab_allocation+0xe4/0x110 mm/kasan/common.c:235 kasan_slab_pre_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:2622 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x192/0x590 mm/slub.c:6692 nvif_vmm_dtor+0x31/0x50 drivers/gpu/drm/nouveau/nvif/vmm.c:194 nouveau_vmm_fini+0x16/0x50 drivers/gpu/drm/nouveau/nouveau_vmm.c:127 nouveau_cli_fini+0x10e/0x210 drivers/gpu/drm/nouveau/nouveau_drm.c:225 nouveau_drm_open+0x24e/0x740 drivers/gpu/drm/nouveau/nouveau_drm.c:1255 drm_file_alloc+0x5f2/0xad0 drivers/gpu/drm/drm_file.c:176 drm_open_helper+0x1d7/0x4a0 drivers/gpu/drm/drm_file.c:335 drm_open+0x190/0x3d0 drivers/gpu/drm/drm_file.c:388 drm_stub_open+0x1f2/0x460 drivers/gpu/drm/drm_drv.c:1211 chrdev_open+0x21c/0x660 fs/char_dev.c:411 do_dentry_open+0x59d/0x12b0 fs/open.c:947 vfs_open+0x82/0x390 fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x2345/0x3420 fs/namei.c:4863 do_file_open+0x207/0x460 fs/namei.c:4892 do_sys_openat2+0xd1/0x1d0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x144/0x200 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x690 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc6d687594d Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc6d5295008 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc6d6b06180 RCX: 00007fc6d687594d RDX: 0000000000022501 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007fc6d691c303 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc6d6b06218 R14: 00007fc6d6b06180 R15: 00007ffd9451d760 Allocated by task 2567 on cpu 1 at 163.593900s: kasan_save_stack+0x24/0x50 mm/kasan/common.c:57 kasan_save_track+0x17/0x60 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_noprof+0x304/0x7c0 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] nvif_vmm_ctor+0x3c0/0x7e0 drivers/gpu/drm/nouveau/nvif/vmm.c:237 nouveau_vmm_init+0x40/0x90 drivers/gpu/drm/nouveau/nouveau_vmm.c:134 nouveau_cli_init+0x7b9/0 ---truncated--- ## Affected - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 023e7a01f8fb27799f0987b5bcda325d73a2904c` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 375901ac0f286e81be00a4126e57d488cb401884` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < bf542ecd4f60d4689818d194e7ca74772fe0f8b5` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < f09f4a536935b15539f2de9fe775a2641202be90` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 279e5ac137370e274a09dd552547ae6bddd0d4d5` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 109a8d2d5b7d2719ebe09df3f9241023900b3846` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 872a5473c02a26c955be44d52b7ab2f8ea70a2cf` - `Linux >= 20d8a88e557aae5264e793f4626c45cd644c7144 < 97077ac87afe9e91ec074ef0be64454e7ccbf344` - `Linux 4.11` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.