{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23427",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23427"
  ],
  "published": "2026-04-03T15:24:34Z",
  "summary": "ksmbd: fix use-after-free in durable v2 replay of active file handles",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in durable v2 replay of active file handles\n\nparse_durable_handle_context() unconditionally assigns dh_info->fp->conn\nto the current connection when handling a DURABLE_REQ_V2 context with\nSMB2_FLAGS_REPLAY_OPERATION. ksmbd_lookup_fd_cguid() does not filter by\nfp->conn, so it returns file handles that are already actively connected.\nThe unconditional overwrite replaces fp->conn, and when the overwriting\nconnection is subsequently freed, __ksmbd_close_fd() dereferences the\nstale fp->conn via spin_lock(&fp->conn->llist_lock), causing a\nuse-after-free.\n\nKASAN report:\n\n[    7.349357] ==================================================================\n[    7.349607] BUG: KASAN: slab-use-after-free in _raw_spin_lock+0x75/0xe0\n[    7.349811] Write of size 4 at addr ffff8881056ac18c by task kworker/1:2/108\n[    7.350010]\n[    7.350064] CPU: 1 UID: 0 PID: 108 Comm: kworker/1:2 Not tainted 7.0.0-rc3+ #58 PREEMPTLAZY\n[    7.350068] 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[    7.350070] Workqueue: ksmbd-io handle_ksmbd_work\n[    7.350083] Call Trace:\n[    7.350087]  <TASK>\n[    7.350087]  dump_stack_lvl+0x64/0x80\n[    7.350094]  print_report+0xce/0x660\n[    7.350100]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[    7.350101]  ? __pfx___mod_timer+0x10/0x10\n[    7.350106]  ? _raw_spin_lock+0x75/0xe0\n[    7.350108]  kasan_report+0xce/0x100\n[    7.350109]  ? _raw_spin_lock+0x75/0xe0\n[    7.350114]  kasan_check_range+0x105/0x1b0\n[    7.350116]  _raw_spin_lock+0x75/0xe0\n[    7.350118]  ? __pfx__raw_spin_lock+0x10/0x10\n[    7.350119]  ? __call_rcu_common.constprop.0+0x25e/0x780\n[    7.350125]  ? close_id_del_oplock+0x2cc/0x4e0\n[    7.350128]  __ksmbd_close_fd+0x27f/0xaf0\n[    7.350131]  ksmbd_close_fd+0x135/0x1b0\n[    7.350133]  smb2_close+0xb19/0x15b0\n[    7.350142]  ? __pfx_smb2_close+0x10/0x10\n[    7.350143]  ? xas_load+0x18/0x270\n[    7.350146]  ? _raw_spin_lock+0x84/0xe0\n[    7.350148]  ? __pfx__raw_spin_lock+0x10/0x10\n[    7.350150]  ? _raw_spin_unlock+0xe/0x30\n[    7.350151]  ? ksmbd_smb2_check_message+0xeb2/0x24c0\n[    7.350153]  ? ksmbd_tree_conn_lookup+0xcd/0xf0\n[    7.350154]  handle_ksmbd_work+0x40f/0x1080\n[    7.350156]  process_one_work+0x5fa/0xef0\n[    7.350162]  ? assign_work+0x122/0x3e0\n[    7.350163]  worker_thread+0x54b/0xf70\n[    7.350165]  ? __pfx_worker_thread+0x10/0x10\n[    7.350166]  kthread+0x346/0x470\n[    7.350170]  ? recalc_sigpending+0x19b/0x230\n[    7.350176]  ? __pfx_kthread+0x10/0x10\n[    7.350178]  ret_from_fork+0x4fb/0x6c0\n[    7.350183]  ? __pfx_ret_from_fork+0x10/0x10\n[    7.350185]  ? __switch_to+0x36c/0xbe0\n[    7.350188]  ? __pfx_kthread+0x10/0x10\n[    7.350190]  ret_from_fork_asm+0x1a/0x30\n[    7.350197]  </TASK>\n[    7.350197]\n[    7.355160] Allocated by task 123:\n[    7.355261]  kasan_save_stack+0x33/0x60\n[    7.355373]  kasan_save_track+0x14/0x30\n[    7.355484]  __kasan_kmalloc+0x8f/0xa0\n[    7.355593]  ksmbd_conn_alloc+0x44/0x6d0\n[    7.355711]  ksmbd_kthread_fn+0x243/0xd70\n[    7.355839]  kthread+0x346/0x470\n[    7.355942]  ret_from_fork+0x4fb/0x6c0\n[    7.356051]  ret_from_fork_asm+0x1a/0x30\n[    7.356164]\n[    7.356214] Freed by task 134:\n[    7.356305]  kasan_save_stack+0x33/0x60\n[    7.356416]  kasan_save_track+0x14/0x30\n[    7.356527]  kasan_save_free_info+0x3b/0x60\n[    7.356646]  __kasan_slab_free+0x43/0x70\n[    7.356761]  kfree+0x1ca/0x430\n[    7.356862]  ksmbd_tcp_disconnect+0x59/0xe0\n[    7.356993]  ksmbd_conn_handler_loop+0x77e/0xd40\n[    7.357138]  kthread+0x346/0x470\n[    7.357240]  ret_from_fork+0x4fb/0x6c0\n[    7.357350]  ret_from_fork_asm+0x1a/0x30\n[    7.357463]\n[    7.357513] The buggy address belongs to the object at ffff8881056ac000\n[    7.357513]  which belongs to the cache kmalloc-1k of size 1024\n[    7.357857] The buggy address is located 396 bytes inside of\n[    7.357857]  freed 1024-byte region \n---truncated---",
  "affected": [
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