{"id":"CVE-2026-23428","summary":"ksmbd: fix use-after-free of share_conf in compound request","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free of share_conf in compound request\n\nsmb2_get_ksmbd_tcon() reuses work-\u003etcon in compound requests without\nvalidating tcon-\u003et_state. ksmbd_tree_conn_lookup() checks t_state ==\nTREE_CONNECTED on the initial lookup path, but the compound reuse path\nbypasses this check entirely.\n\nIf a prior command in the compound (SMB2_TREE_DISCONNECT) sets t_state\nto TREE_DISCONNECTED and frees share_conf via ksmbd_share_config_put(),\nsubsequent commands dereference the freed share_conf through\nwork-\u003etcon-\u003eshare_conf.\n\nKASAN report:\n\n[    4.144653] ==================================================================\n[    4.145059] BUG: KASAN: slab-use-after-free in smb2_write+0xc74/0xe70\n[    4.145415] Read of size 4 at addr ffff88810430c194 by task kworker/1:1/44\n[    4.145772]\n[    4.145867] CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted 7.0.0-rc3+ #60 PREEMPTLAZY\n[    4.145871] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[    4.145875] Workqueue: ksmbd-io handle_ksmbd_work\n[    4.145888] Call Trace:\n[    4.145892]  \u003cTASK\u003e\n[    4.145894]  dump_stack_lvl+0x64/0x80\n[    4.145910]  print_report+0xce/0x660\n[    4.145919]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[    4.145928]  ? smb2_write+0xc74/0xe70\n[    4.145931]  kasan_report+0xce/0x100\n[    4.145934]  ? smb2_write+0xc74/0xe70\n[    4.145937]  smb2_write+0xc74/0xe70\n[    4.145939]  ? __pfx_smb2_write+0x10/0x10\n[    4.145942]  ? _raw_spin_unlock+0xe/0x30\n[    4.145945]  ? ksmbd_smb2_check_message+0xeb2/0x24c0\n[    4.145948]  ? smb2_tree_disconnect+0x31c/0x480\n[    4.145951]  handle_ksmbd_work+0x40f/0x1080\n[    4.145953]  process_one_work+0x5fa/0xef0\n[    4.145962]  ? assign_work+0x122/0x3e0\n[    4.145964]  worker_thread+0x54b/0xf70\n[    4.145967]  ? __pfx_worker_thread+0x10/0x10\n[    4.145970]  kthread+0x346/0x470\n[    4.145976]  ? recalc_sigpending+0x19b/0x230\n[    4.145980]  ? __pfx_kthread+0x10/0x10\n[    4.145984]  ret_from_fork+0x4fb/0x6c0\n[    4.145992]  ? __pfx_ret_from_fork+0x10/0x10\n[    4.145995]  ? __switch_to+0x36c/0xbe0\n[    4.145999]  ? __pfx_kthread+0x10/0x10\n[    4.146003]  ret_from_fork_asm+0x1a/0x30\n[    4.146013]  \u003c/TASK\u003e\n[    4.146014]\n[    4.149858] Allocated by task 44:\n[    4.149953]  kasan_save_stack+0x33/0x60\n[    4.150061]  kasan_save_track+0x14/0x30\n[    4.150169]  __kasan_kmalloc+0x8f/0xa0\n[    4.150274]  ksmbd_share_config_get+0x1dd/0xdd0\n[    4.150401]  ksmbd_tree_conn_connect+0x7e/0x600\n[    4.150529]  smb2_tree_connect+0x2e6/0x1000\n[    4.150645]  handle_ksmbd_work+0x40f/0x1080\n[    4.150761]  process_one_work+0x5fa/0xef0\n[    4.150873]  worker_thread+0x54b/0xf70\n[    4.150978]  kthread+0x346/0x470\n[    4.151071]  ret_from_fork+0x4fb/0x6c0\n[    4.151176]  ret_from_fork_asm+0x1a/0x30\n[    4.151286]\n[    4.151332] Freed by task 44:\n[    4.151418]  kasan_save_stack+0x33/0x60\n[    4.151526]  kasan_save_track+0x14/0x30\n[    4.151634]  kasan_save_free_info+0x3b/0x60\n[    4.151751]  __kasan_slab_free+0x43/0x70\n[    4.151861]  kfree+0x1ca/0x430\n[    4.151952]  __ksmbd_tree_conn_disconnect+0xc8/0x190\n[    4.152088]  smb2_tree_disconnect+0x1cd/0x480\n[    4.152211]  handle_ksmbd_work+0x40f/0x1080\n[    4.152326]  process_one_work+0x5fa/0xef0\n[    4.152438]  worker_thread+0x54b/0xf70\n[    4.152545]  kthread+0x346/0x470\n[    4.152638]  ret_from_fork+0x4fb/0x6c0\n[    4.152743]  ret_from_fork_asm+0x1a/0x30\n[    4.152853]\n[    4.152900] The buggy address belongs to the object at ffff88810430c180\n[    4.152900]  which belongs to the cache kmalloc-96 of size 96\n[    4.153226] The buggy address is located 20 bytes inside of\n[    4.153226]  freed 96-byte region [ffff88810430c180, ffff88810430c1e0)\n[    4.153549]\n[    4.153596] The buggy address belongs to the physical page:\n[    4.153750] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810430ce80 pfn:0x10430c\n[    4.154000] flags: 0x\n---truncated---","modified":"2026-05-18T05:59:44.210614015Z","published":"2026-04-03T15:15:14.981Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23428.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7f7468fd2a7554cea91b7d430335a3dbf01dcc09"},{"type":"WEB","url":"https://git.kernel.org/stable/c/806f13752652216db0c309392b4db3e64eeed4f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a5929c2020ce54e1dcbd1078c0f30b8aaf73c105"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c33615f995aee80657b9fdfbc4ee7f49c2bd733d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c742b46a153d3ff95ff0825ab1950c87b9e14470"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d08417981155883068b7260d9500ca306a03edac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eae0dc86f71e6f3294c0cd7ffc05039258d243af"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23428.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23428"},{"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":"eb947403518ea3d93f6d89264bb1f5416bb0c7d0"},{"fixed":"d08417981155883068b7260d9500ca306a03edac"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"854156d12caa9d36de1cf5f084591c7686cc8a9d"},{"fixed":"eae0dc86f71e6f3294c0cd7ffc05039258d243af"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5005bcb4219156f1bf7587b185080ec1da08518e"},{"fixed":"806f13752652216db0c309392b4db3e64eeed4f2"},{"fixed":"c742b46a153d3ff95ff0825ab1950c87b9e14470"},{"fixed":"7f7468fd2a7554cea91b7d430335a3dbf01dcc09"},{"fixed":"a5929c2020ce54e1dcbd1078c0f30b8aaf73c105"},{"fixed":"c33615f995aee80657b9fdfbc4ee7f49c2bd733d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"d1066c1b3663401cd23c0d6e60cdae750ce00c0f"}]}],"versions":["v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15.194","v5.15.193","v5.15.192","v5.15.191","v5.15.190","v5.15.189","v5.15.188","v5.15.187","v5.15.186","v5.15.185","v5.15.184","v5.15.183","v5.15.182","v5.15.181","v5.15.180","v5.15.179","v5.15.178","v5.15.177","v5.15.176","v5.15.175","v5.15.174","v5.15.173","v5.15.172","v5.15.171","v5.15.170","v5.15.169","v5.15.168","v5.15.167","v5.15.166","v5.15.165","v5.15.164","v5.15.163","v5.15.162","v5.15.161","v5.15.160","v5.15.159","v5.15.158","v5.15.157","v5.15.156","v5.15.155","v5.15.154","v5.15.153","v5.15.152","v5.15.151","v5.15.150","v5.15.149","v5.15.148","v5.15.147","v5.15.146","v5.15.145","v5.15.144","v5.15.143","v5.15.142","v5.15.141","v5.15.140","v5.15.139","v5.15.138","v5.15.137","v5.15.136","v5.15.135","v5.15.134","v5.15.133","v5.15.132","v5.15.131","v5.15.130","v5.15.129","v5.15.128","v5.15.127","v5.15.126","v5.15.125","v5.15.124","v5.15.123","v5.15.122","v5.15.121","v6.1.166","v6.1.165","v6.1.164","v6.1.163","v6.1.162","v6.1.161","v6.1.160","v6.1.159","v6.1.158","v6.1.157","v6.1.156","v6.1.155","v6.1.154","v6.1.153","v6.1.152","v6.1.151","v6.1.150","v6.1.149","v6.1.148","v6.1.147","v6.1.146","v6.1.145","v6.1.144","v6.1.143","v6.1.142","v6.1.141","v6.1.140","v6.1.139","v6.1.138","v6.1.137","v6.1.136","v6.1.135","v6.1.134","v6.1.133","v6.1.132","v6.1.131","v6.1.130","v6.1.129","v6.1.128","v6.1.127","v6.1.126","v6.1.125","v6.1.124","v6.1.123","v6.1.122","v6.1.121","v6.1.120","v6.1.119","v6.1.118","v6.1.117","v6.1.116","v6.1.115","v6.1.114","v6.1.113","v6.1.112","v6.1.111","v6.1.110","v6.1.109","v6.1.108","v6.1.107","v6.1.106","v6.1.105","v6.1.104","v6.1.103","v6.1.102","v6.1.101","v6.1.100","v6.1.99","v6.1.98","v6.1.97","v6.1.96","v6.1.95","v6.1.94","v6.1.93","v6.1.92","v6.1.91","v6.1.90","v6.1.89","v6.1.88","v6.1.87","v6.1.86","v6.1.85","v6.1.84","v6.1.83","v6.1.82","v6.1.81","v6.1.80","v6.1.79","v6.1.78","v6.1.77","v6.1.76","v6.1.75","v6.1.74","v6.1.73","v6.1.72","v6.1.71","v6.1.70","v6.1.69","v6.1.68","v6.1.67","v6.1.66","v6.1.65","v6.1.64","v6.1.63","v6.1.62","v6.1.61","v6.1.60","v6.1.59","v6.1.58","v6.1.57","v6.1.56","v6.1.55","v6.1.54","v6.1.53","v6.1.52","v6.1.51","v6.1.50","v6.1.49","v6.1.48","v6.1.47","v6.1.46","v6.1.45","v6.1.44","v6.1.43","v6.1.42","v6.1.41","v6.1.40","v6.1.39","v6.1.38","v6.1.37","v6.1.36","v6.3.9","v6.3.8","v6.3.7","v6.3.6","v6.3.5","v6.3.4","v6.3.3","v6.3.2","v6.3","v6.3.1","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.2-rc6","v6.2-rc1","v6.2","v6.2-rc2","v6.2-rc8","v6.2-rc5","v6.2-rc4","v6.2-rc7","v6.2-rc3","v6.1-rc1","v6.1","v6.1-rc8","v6.1-rc3","v6.1-rc6","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.1-r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