{"id":"CVE-2026-90170","summary":"ksmbd: validate ipc response length before dereferencing its fields","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate ipc response length before dereferencing its fields\n\nipc_validate_msg() computes the expected message size by reading length\nfields out of the response buffer supplied by the userspace ksmbd daemon\n(payload_sz, session_key_len, ngroups, ...).  Those fields are read before\nthe buffer is verified to be large enough to contain the struct they belong\nto, so a short response makes the read land past the end of the allocation.\n\nhandle_response() sizes entry-\u003eresponse purely from the netlink attribute\nlength (nla_len()) and only guards the leading handle read, so the daemon\ncan install a response as small as the kmalloc-8 object seen below.  When\nipc_msg_send_request() then calls ipc_validate_msg() for a\nKSMBD_EVENT_RPC_REQUEST, the cast to struct ksmbd_rpc_command reads\nresp-\u003epayload_sz at offset 8 of an 8-byte allocation:\n\n[ 3697.841381] ==================================================================\n[ 3697.844099] BUG: KASAN: slab-out-of-bounds in ipc_msg_send_request+0x763/0x800\n[ 3697.846604] Read of size 4 at addr ffff888105f95910 by task kworker/4:3/20682\n[ 3697.849061]\n[ 3697.849801] CPU: 4 UID: 0 PID: 20682 Comm: kworker/4:3 Not tainted 7.2.0-rc3-next-20260717-virtme #117 PREEMPT(lazy)\n[ 3697.850077] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n[ 3697.850303] Workqueue: ksmbd-io handle_ksmbd_work\n[ 3697.850592] Call Trace:\n[ 3697.850794]  \u003cTASK\u003e\n[ 3697.850952]  __dump_stack+0x21/0x60\n[ 3697.851239]  dump_stack_lvl+0xc2/0x100\n[ 3697.851528]  print_address_description+0x77/0x200\n[ 3697.851816]  ? ipc_msg_send_request+0x763/0x800\n[ 3697.852024]  print_report+0x58/0x70\n[ 3697.852316]  kasan_report+0x117/0x150\n[ 3697.852585]  ? down_write+0x146/0x1f0\n[ 3697.852809]  ? ipc_msg_send_request+0x763/0x800\n[ 3697.853082]  ipc_msg_send_request+0x763/0x800\n[ 3697.853385]  ? __pfx_ipc_msg_send_request+0x10/0x10\n[ 3697.853604]  ? kasan_unpoison+0x48/0x70\n[ 3697.853936]  ? __pfx___up_read+0x10/0x10\n[ 3697.854221]  ksmbd_rpc_ioctl+0x380/0x520\n[ 3697.854542]  ? __pfx_ksmbd_rpc_ioctl+0x10/0x10\n[ 3697.854757]  ? kasan_unpoison+0x48/0x70\n[ 3697.854962]  ? copy_from_kernel_nofault+0x32c/0x4e0\n[ 3697.855166]  ? kasan_unpoison+0x48/0x70\n[ 3697.855416]  fsctl_pipe_transceive+0x139/0x7a0\n[ 3697.855705]  ? __pfx_copy_from_kernel_nofault+0x10/0x10\n[ 3697.855937]  ? __pfx_fsctl_pipe_transceive+0x10/0x10\n[ 3697.856388]  ? __sanitizer_cov_trace_switch+0x7b/0x140\n[ 3697.856620]  smb2_ioctl+0x1141/0x3420\n[ 3697.856994]  ? __pfx_smb2_ioctl+0x10/0x10\n[ 3697.857182]  ? get_smb2_cmd_val+0xe3/0x1c0\n[ 3697.857655]  handle_ksmbd_work+0x9ad/0x15e0\n[ 3697.858034]  ? __pfx_handle_ksmbd_work+0x10/0x10\n[ 3697.858251]  ? lock_release+0xf7/0x360\n[ 3697.858466]  ? process_scheduled_works+0x954/0x1600\n[ 3697.858698]  ? process_scheduled_works+0x954/0x1600\n[ 3697.858905]  process_scheduled_works+0xc22/0x1600\n[ 3697.859368]  ? __pfx_process_scheduled_works+0x10/0x10\n[ 3697.859637]  ? __pfx_assign_work+0x10/0x10\n[ 3697.859896]  ? lock_is_held_type+0x7b/0x110\n[ 3697.860146]  worker_thread+0x975/0xee0\n[ 3697.860524]  ? __pfx_do_raw_spin_lock+0x10/0x10\n[ 3697.860830]  ? __kthread_parkme+0x21e/0x260\n[ 3697.861105]  kthread+0x3a6/0x490\n[ 3697.861423]  ? __pfx_worker_thread+0x10/0x10\n[ 3697.861643]  ? __pfx_kthread+0x10/0x10\n[ 3697.861878]  ret_from_fork+0x55a/0xa20\n[ 3697.862194]  ? __pfx_ret_from_fork+0x10/0x10\n[ 3697.862480]  ? __pfx_kthread+0x10/0x10\n[ 3697.862714]  ret_from_fork_asm+0x1a/0x30\n[ 3697.862965]  \u003c/TASK\u003e\n[ 3697.863039]\n[ 3697.938882] Allocated by task 20761:\n[ 3697.940257]  kasan_save_track+0x3e/0x80\n[ 3697.941782]  __kasan_kmalloc+0x72/0x90\n[ 3697.943228]  __kvmalloc_node_noprof+0x3e9/0x6a0\n[ 3697.944948]  handle_generic_event+0x59b/0x750\n[ 3697.946592]  genl_family_rcv_msg_doit+0x3d6/0x560\n[ 3697.946977]  genl_rcv_msg+0x67c/0x900\n[ 3697.947224]  netlink_rcv_skb+0x286/0x580\n[ 3697.947488]  genl_rcv+0x2d/0x80\n[ 3\n---truncated---","modified":"2026-09-19T03:47:31.221291039Z","published":"2026-09-17T16:06:58.486Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90170.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595"},{"type":"WEB","url":"https://git.kernel.org/stable/c/17b7d1a2b4d5473df5dca8c9a07d65021806c23a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/398cba4b646a6c08ff3d79e6b1e70e5ddae8a065"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e9b33376bd07bca4175f7bcc2d6034ef250f8181"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90170.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90170"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bf396208418371174869baba9434535cd3288e80"},{"fixed":"17b7d1a2b4d5473df5dca8c9a07d65021806c23a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7dd0c858e1909769a4c91842724315ee74f1a5f1"},{"fixed":"398cba4b646a6c08ff3d79e6b1e70e5ddae8a065"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"299db777ea0cfa5c407e41b045c24a14c034c27b"},{"fixed":"0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d6a6aa81eac2c9bff66dc6e191179cb69a14426b"},{"fixed":"c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52"},{"fixed":"e9b33376bd07bca4175f7bcc2d6034ef250f8181"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"99c631d0366c1eab8fb188fe66425f4581ebdde4"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.141"},{"fixed":"6.6.157"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.84"},{"fixed":"6.12.110"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.25"},{"fixed":"6.18.52"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7.0.2"},{"fixed":"7.1"}]}],"versions":["v6.6.156","v6.6.155","v6.6.154","v6.6.153","v6.6.152","v6.6.151","v6.6.150","v6.6.149","v6.6.148","v6.6.147","v6.6.146","v6.6.145","v6.6.144","v6.6.143","v6.6.142","v6.6.141","v6.12.109","v6.12.108","v6.12.107","v6.12.106","v6.12.105","v6.12.104","v6.12.103","v6.12.102","v6.12.101","v6.12.100","v6.12.99","v6.12.98","v6.12.97","v6.12.96","v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.18.51","v6.18.50","v6.18.49","v6.18.48","v6.18.47","v6.18.46","v6.18.45","v6.18.44","v6.18.43","v6.18.42","v6.18.41","v6.18.40","v6.18.39","v6.18.38","v6.18.37","v6.18.36","v6.18.35","v6.18.34","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v6.18.26","v6.18.25","v7.0","v7.0-rc1","v7.0.1","v7.0-rc5","v7.0-rc6","v7.0-rc7","v7.0-rc3","v7.0-rc4","v6.19-rc2","v7.0-rc2","v6.19","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.19-rc3","v6.18","v6.18-rc1","v6.18-rc7","v6.18-rc3","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.18-rc4","v6.17","v6.17-rc7","v6.17-rc1","v6.17-rc2","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.16-rc6","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.14-rc3","v6.15","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.15-rc5","v6.14","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.14-rc4","v6.14-rc5","v6.14-rc2","v6.13","v6.13-rc1","v6.13-rc6","v6.13-rc7","v6.13-rc2","v6.13-rc5","v6.13-rc3","v6.12-rc1","v6.13-rc4","v6.12","v6.12-rc7","v6.12-rc3","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.12-rc2","v6.11-rc1","v6.11-rc5","v6.11","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.8-rc1","v6.7-rc1","v6.8-rc7","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.7","v6.7-rc3","v6.7-rc8","v6.7-rc7","v6.7-rc6","v6.7-rc2","v6.7-rc4","v6.7-rc5","v6.6","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v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