--- id: CVE-2026-98511 title: 'drm/nouveau: don''t bump pin count on failed re-pin in nouveau_bo_pin_locked()' summary: |- In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: don't bump pin count on failed re-pin in nouveau_bo_pin_locked() nouveau_bo_pin_locked() checks whether an already pinned BO is in a memory domain compati… severity: none vendor: Linux product: Linux affected: - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < a6e755acf85793a7b4d29ba27b5421af1087263f - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 5cb7109f0f5f1b47b172e2d5b868d4ce3ae687f8 - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 9924c1d64405be8d10b906368dfb1cfe0d0c6bf0 - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 73c7093e6cc1e6b181a79e16eccc4b8d4f34d8ee - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 19f5a5839b308697824ff46e6213a2b4cb677771 - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 189ffc7b6cad6390c0695031cb6c7c63472981e8 - >- Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 6a6870d3077faa501ca97760057ddca22b68418d - Linux 3.19 published: '2026-10-18' updated: '2026-10-18' sourceUpdated: '2026-10-18T15:17:25.033Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98511' references: - url: 'https://git.kernel.org/stable/c/a6e755acf85793a7b4d29ba27b5421af1087263f' - url: 'https://git.kernel.org/stable/c/5cb7109f0f5f1b47b172e2d5b868d4ce3ae687f8' - url: 'https://git.kernel.org/stable/c/9924c1d64405be8d10b906368dfb1cfe0d0c6bf0' - url: 'https://git.kernel.org/stable/c/73c7093e6cc1e6b181a79e16eccc4b8d4f34d8ee' - url: 'https://git.kernel.org/stable/c/19f5a5839b308697824ff46e6213a2b4cb677771' - url: 'https://git.kernel.org/stable/c/189ffc7b6cad6390c0695031cb6c7c63472981e8' - url: 'https://git.kernel.org/stable/c/6a6870d3077faa501ca97760057ddca22b68418d' tags: - cve.org ingestedAt: '2026-10-18T15:45:12.285Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: don't bump pin count on failed re-pin in nouveau_bo_pin_locked() nouveau_bo_pin_locked() checks whether an already pinned BO is in a memory domain compatible with a new pin request. When the domains are incompatible, it sets -EBUSY but still calls ttm_bo_pin() before returning. Callers treat a failed nouveau_bo_pin() as not having acquired a new pin, so the extra pin count is never decreased by a matching unpin. This triggers the warning in ttm_bo_release(): WARN_ON_ONCE(bo->pin_count); Found when fuzzing the nouveau driver with a modified Syzkaller: WARNING: drivers/gpu/drm/ttm/ttm_bo.c:256 at ttm_bo_release+0x827/0x9e0 drivers/gpu/drm/ttm/ttm_bo.c:256, CPU#1: syz.3.24/2212 Modules linked in: CPU: 1 UID: 0 PID: 2212 Comm: syz.3.24 Not tainted 7.2.0 #24 PREEMPT(lazy) nouveau 0000:01:00.0: gsp:msg fn:103 len:0x40/0x20 res:0x19 resp:0x19 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:ttm_bo_release+0x827/0x9e0 drivers/gpu/drm/ttm/ttm_bo.c:256 Code: 02 00 0f 85 51 01 00 00 48 8b 7b 08 e8 d2 20 01 00 e9 80 fd ff ff e8 d8 15 c0 fe 90 0f 0b 90 e9 e1 f8 ff ff e8 ca 15 c0 fe 90 <0f> 0b 90 e9 a4 f8 ff ff e8 bc 15 c0 fe be 03 00 00 00 4c 89 e7 e8 msg: 00000000: 05 00 d0 c1 04 00 f0 f1 01 30 00 00 2d 90 00 00 .........0..-... RSP: 0018:ffffc9000f5cf710 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888018e5d2a8 RCX: ffffffff82bb1b36 RDX: ffff888017b68000 RSI: 0000000000000004 RDI: ffff888018e5d2a8 msg: 00000010: 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ RBP: ffff88801261c720 R08: 0000000000000001 R09: ffffed10031cba55 R10: ffff888018e5d2ab R11: 00000000000000f3 R12: ffff888018e5d290 R13: ffff888018e5d2d4 R14: ffff88801b219c18 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880e0f6f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31223ffc CR3: 0000000028e00005 CR4: 0000000000770ef0 PKRU: 80000000 Call Trace: kref_put include/linux/kref.h:65 [inline] ttm_bo_put drivers/gpu/drm/ttm/ttm_bo.c:325 [inline] ttm_bo_fini+0x55/0x80 drivers/gpu/drm/ttm/ttm_bo.c:330 nouveau_gem_object_del+0xb2/0x1b0 drivers/gpu/drm/nouveau/nouveau_gem.c:90 drm_gem_object_free+0x5f/0x90 drivers/gpu/drm/drm_gem.c:1165 kref_put include/linux/kref.h:65 [inline] __drm_gem_object_put include/drm/drm_gem.h:562 [inline] drm_gem_object_put include/drm/drm_gem.h:575 [inline] nouveau_abi16_chan_fini.constprop.0+0x44f/0x5a0 drivers/gpu/drm/nouveau/nouveau_abi16.c:195 nouveau 0000:01:00.0: syz.2.23[2209]: Unknown handle 0x00000000 nouveau_abi16_fini+0x1d0/0x340 drivers/gpu/drm/nouveau/nouveau_abi16.c:225 nouveau_drm_postclose+0x18b/0x3e0 drivers/gpu/drm/nouveau/nouveau_drm.c:1284 nouveau 0000:01:00.0: syz.2.23[2209]: validate_init drm_file_free.part.0+0x6d6/0xb60 drivers/gpu/drm/drm_file.c:267 drm_file_free drivers/gpu/drm/drm_file.c:237 [inline] drm_close_helper.isra.0+0x11a/0x160 drivers/gpu/drm/drm_file.c:290 drm_release+0x1ab/0x330 drivers/gpu/drm/drm_file.c:438 __fput+0x39c/0xa60 fs/file_table.c:512 nouveau 0000:01:00.0: syz.2.23[2209]: validate: -2 task_work_run+0x15a/0x230 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x82b/0x25a0 kernel/exit.c:1009 do_group_exit+0xc2/0x280 kernel/exit.c:1152 get_signal+0x1d6e/0x1f30 kernel/signal.c:3046 arch_do_signal_or_restart+0x7d/0x6e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0xdf/0x440 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x4f8/0x690 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RI ---truncated--- ## Affected - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < a6e755acf85793a7b4d29ba27b5421af1087263f` - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 5cb7109f0f5f1b47b172e2d5b868d4ce3ae687f8` - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 9924c1d64405be8d10b906368dfb1cfe0d0c6bf0` - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 73c7093e6cc1e6b181a79e16eccc4b8d4f34d8ee` - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 19f5a5839b308697824ff46e6213a2b4cb677771` - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 189ffc7b6cad6390c0695031cb6c7c63472981e8` - `Linux >= ad76b3f7c7a0836e74ac0e316e03988ef3c43564 < 6a6870d3077faa501ca97760057ddca22b68418d` - `Linux 3.19` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.