CVE-2026-23428

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix use-after-free of share_conf in compound request

smb2_get_ksmbd_tcon() reuses work->tcon in compound requests without

validating tcon->t_state. ksmbd_tree_conn_lookup() checks t_state ==

TREE_CONNECTED on the initial lookup path, but the compound reuse path

bypasses this check entirely.

If a prior command in the compound (SMB2_TREE_DISCONNECT) sets t_state

to TREE_DISCONNECTED and frees share_conf via ksmbd_share_config_put(),

subsequent commands dereference the freed share_conf through

work->tcon->share_conf.

KASAN report:

[ 4.144653] ==================================================================

[ 4.145059] BUG: KASAN: slab-use-after-free in smb2_write+0xc74/0xe70

[ 4.145415] Read of size 4 at addr ffff88810430c194 by task kworker/1:1/44

[ 4.145772]

[ 4.145867] CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted 7.0.0-rc3+ #60 PREEMPTLAZY

[ 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

[ 4.145875] Workqueue: ksmbd-io handle_ksmbd_work

[ 4.145888] Call Trace:

[ 4.145892] <TASK>

[ 4.145894] dump_stack_lvl+0x64/0x80

[ 4.145910] print_report+0xce/0x660

[ 4.145919] ? __pfx__raw_spin_lock_irqsave+0x10/0x10

[ 4.145928] ? smb2_write+0xc74/0xe70

[ 4.145931] kasan_report+0xce/0x100

[ 4.145934] ? smb2_write+0xc74/0xe70

[ 4.145937] smb2_write+0xc74/0xe70

[ 4.145939] ? __pfx_smb2_write+0x10/0x10

[ 4.145942] ? _raw_spin_unlock+0xe/0x30

[ 4.145945] ? ksmbd_smb2_check_message+0xeb2/0x24c0

[ 4.145948] ? smb2_tree_disconnect+0x31c/0x480

[ 4.145951] handle_ksmbd_work+0x40f/0x1080

[ 4.145953] process_one_work+0x5fa/0xef0

[ 4.145962] ? assign_work+0x122/0x3e0

[ 4.145964] worker_thread+0x54b/0xf70

[ 4.145967] ? __pfx_worker_thread+0x10/0x10

[ 4.145970] kthread+0x346/0x470

[ 4.145976] ? recalc_sigpending+0x19b/0x230

[ 4.145980] ? __pfx_kthread+0x10/0x10

[ 4.145984] ret_from_fork+0x4fb/0x6c0

[ 4.145992] ? __pfx_ret_from_fork+0x10/0x10

[ 4.145995] ? __switch_to+0x36c/0xbe0

[ 4.145999] ? __pfx_kthread+0x10/0x10

[ 4.146003] ret_from_fork_asm+0x1a/0x30

[ 4.146013] </TASK>

[ 4.146014]

[ 4.149858] Allocated by task 44:

[ 4.149953] kasan_save_stack+0x33/0x60

[ 4.150061] kasan_save_track+0x14/0x30

[ 4.150169] __kasan_kmalloc+0x8f/0xa0

[ 4.150274] ksmbd_share_config_get+0x1dd/0xdd0

[ 4.150401] ksmbd_tree_conn_connect+0x7e/0x600

[ 4.150529] smb2_tree_connect+0x2e6/0x1000

[ 4.150645] handle_ksmbd_work+0x40f/0x1080

[ 4.150761] process_one_work+0x5fa/0xef0

[ 4.150873] worker_thread+0x54b/0xf70

[ 4.150978] kthread+0x346/0x470

[ 4.151071] ret_from_fork+0x4fb/0x6c0

[ 4.151176] ret_from_fork_asm+0x1a/0x30

[ 4.151286]

[ 4.151332] Freed by task 44:

[ 4.151418] kasan_save_stack+0x33/0x60

[ 4.151526] kasan_save_track+0x14/0x30

[ 4.151634] kasan_save_free_info+0x3b/0x60

[ 4.151751] __kasan_slab_free+0x43/0x70

[ 4.151861] kfree+0x1ca/0x430

[ 4.151952] __ksmbd_tree_conn_disconnect+0xc8/0x190

[ 4.152088] smb2_tree_disconnect+0x1cd/0x480

[ 4.152211] handle_ksmbd_work+0x40f/0x1080

[ 4.152326] process_one_work+0x5fa/0xef0

[ 4.152438] worker_thread+0x54b/0xf70

[ 4.152545] kthread+0x346/0x470

[ 4.152638] ret_from_fork+0x4fb/0x6c0

[ 4.152743] ret_from_fork_asm+0x1a/0x30

[ 4.152853]

[ 4.152900] The buggy address belongs to the object at ffff88810430c180

[ 4.152900] which belongs to the cache kmalloc-96 of size 96

[ 4.153226] The buggy address is located 20 bytes inside of

[ 4.153226] freed 96-byte region [ffff88810430c180, ffff88810430c1e0)

[ 4.153549]

[ 4.153596] The buggy address belongs to the physical page:

[ 4.153750] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810430ce80 pfn:0x10430c

[ 4.154000] flags: 0x

---truncated---