{"id":"CVE-2026-98511","summary":"drm/nouveau: don't bump pin count on failed re-pin in nouveau_bo_pin_locked()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: don't bump pin count on failed re-pin in nouveau_bo_pin_locked()\n\nnouveau_bo_pin_locked() checks whether an already pinned BO is in a\nmemory domain compatible with a new pin request. When the domains are\nincompatible, it sets -EBUSY but still calls ttm_bo_pin() before\nreturning.\n\nCallers treat a failed nouveau_bo_pin() as not having acquired a new pin,\nso the extra pin count is never decreased by a matching unpin.\nThis triggers the warning in ttm_bo_release():\n\n\tWARN_ON_ONCE(bo-\u003epin_count);\n\nFound when fuzzing the nouveau driver with a modified Syzkaller:\n\n\tWARNING: 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\n\tModules linked in:\n\tCPU: 1 UID: 0 PID: 2212 Comm: syz.3.24 Not tainted 7.2.0 #24 PREEMPT(lazy)\n\tnouveau 0000:01:00.0: gsp:msg fn:103 len:0x40/0x20 res:0x19 resp:0x19\n\tHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n\tRIP: 0010:ttm_bo_release+0x827/0x9e0 drivers/gpu/drm/ttm/ttm_bo.c:256\n\tCode: 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 \u003c0f\u003e 0b 90 e9 a4 f8 ff ff e8 bc 15 c0 fe be 03 00 00 00 4c 89 e7 e8\n\tmsg: 00000000: 05 00 d0 c1 04 00 f0 f1 01 30 00 00 2d 90 00 00  .........0..-...\n\tRSP: 0018:ffffc9000f5cf710 EFLAGS: 00010293\n\tRAX: 0000000000000000 RBX: ffff888018e5d2a8 RCX: ffffffff82bb1b36\n\tRDX: ffff888017b68000 RSI: 0000000000000004 RDI: ffff888018e5d2a8\n\tmsg: 00000010: 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n\tRBP: ffff88801261c720 R08: 0000000000000001 R09: ffffed10031cba55\n\tR10: ffff888018e5d2ab R11: 00000000000000f3 R12: ffff888018e5d290\n\tR13: ffff888018e5d2d4 R14: ffff88801b219c18 R15: dffffc0000000000\n\tFS:  0000000000000000(0000) GS:ffff8880e0f6f000(0000) knlGS:0000000000000000\n\tCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\tCR2: 0000001b31223ffc CR3: 0000000028e00005 CR4: 0000000000770ef0\n\tPKRU: 80000000\n\tCall Trace:\n\t\u003cTASK\u003e\n\tkref_put include/linux/kref.h:65 [inline]\n\tttm_bo_put drivers/gpu/drm/ttm/ttm_bo.c:325 [inline]\n\tttm_bo_fini+0x55/0x80 drivers/gpu/drm/ttm/ttm_bo.c:330\n\tnouveau_gem_object_del+0xb2/0x1b0 drivers/gpu/drm/nouveau/nouveau_gem.c:90\n\tdrm_gem_object_free+0x5f/0x90 drivers/gpu/drm/drm_gem.c:1165\n\tkref_put include/linux/kref.h:65 [inline]\n\t__drm_gem_object_put include/drm/drm_gem.h:562 [inline]\n\tdrm_gem_object_put include/drm/drm_gem.h:575 [inline]\n\tnouveau_abi16_chan_fini.constprop.0+0x44f/0x5a0 drivers/gpu/drm/nouveau/nouveau_abi16.c:195\n\tnouveau 0000:01:00.0: syz.2.23[2209]: Unknown handle 0x00000000\n\tnouveau_abi16_fini+0x1d0/0x340 drivers/gpu/drm/nouveau/nouveau_abi16.c:225\n\tnouveau_drm_postclose+0x18b/0x3e0 drivers/gpu/drm/nouveau/nouveau_drm.c:1284\n\tnouveau 0000:01:00.0: syz.2.23[2209]: validate_init\n\tdrm_file_free.part.0+0x6d6/0xb60 drivers/gpu/drm/drm_file.c:267\n\tdrm_file_free drivers/gpu/drm/drm_file.c:237 [inline]\n\tdrm_close_helper.isra.0+0x11a/0x160 drivers/gpu/drm/drm_file.c:290\n\tdrm_release+0x1ab/0x330 drivers/gpu/drm/drm_file.c:438\n\t__fput+0x39c/0xa60 fs/file_table.c:512\n\tnouveau 0000:01:00.0: syz.2.23[2209]: validate: -2\n\ttask_work_run+0x15a/0x230 kernel/task_work.c:233\n\texit_task_work include/linux/task_work.h:40 [inline]\n\tdo_exit+0x82b/0x25a0 kernel/exit.c:1009\n\tdo_group_exit+0xc2/0x280 kernel/exit.c:1152\n\tget_signal+0x1d6e/0x1f30 kernel/signal.c:3046\n\tarch_do_signal_or_restart+0x7d/0x6e0 arch/x86/kernel/signal.c:337\n\t__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]\n\texit_to_user_mode_loop+0xdf/0x440 kernel/entry/common.c:101\n\t__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]\n\tsyscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]\n\tsyscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]\n\tdo_syscall_64+0x4f8/0x690 arch/x86/entry/syscall_64.c:100\n\tentry_SYSCALL_64_after_hwframe+0x77/0x7f\n\tRI\n---truncated---","modified":"2026-10-19T02:45:59.883850012Z","published":"2026-10-18T15:17:25.033Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98511.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/189ffc7b6cad6390c0695031cb6c7c63472981e8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/19f5a5839b308697824ff46e6213a2b4cb677771"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5cb7109f0f5f1b47b172e2d5b868d4ce3ae687f8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a6870d3077faa501ca97760057ddca22b68418d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/73c7093e6cc1e6b181a79e16eccc4b8d4f34d8ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9924c1d64405be8d10b906368dfb1cfe0d0c6bf0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6e755acf85793a7b4d29ba27b5421af1087263f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98511.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98511"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ad76b3f7c7a0836e74ac0e316e03988ef3c43564"},{"fixed":"a6e755acf85793a7b4d29ba27b5421af1087263f"},{"fixed":"5cb7109f0f5f1b47b172e2d5b868d4ce3ae687f8"},{"fixed":"9924c1d64405be8d10b906368dfb1cfe0d0c6bf0"},{"fixed":"73c7093e6cc1e6b181a79e16eccc4b8d4f34d8ee"},{"fixed":"19f5a5839b308697824ff46e6213a2b4cb677771"},{"fixed":"189ffc7b6cad6390c0695031cb6c7c63472981e8"},{"fixed":"6a6870d3077faa501ca97760057ddca22b68418d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98511.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.19.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98511.json"}}],"schema_version":"1.9.0"}