{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.170-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.10-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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-\u003etcon in compound requests without validating tcon-\u003et_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-\u003etcon-\u003eshare_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]  \u003cTASK\u003e [    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]  \u003c/TASK\u003e [    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---",
  "id": "DEBIAN-CVE-2026-23428",
  "modified": "2026-09-14T16:47:31.280844319Z",
  "published": "2026-04-03T16:16:23.993Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-23428"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-23428"
  ]
}