{"cve":"CVE-2023-54203","nvd":{"published":"2025-12-30T13:16:08.420","modified":"2026-10-28T19:10:00.193","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slab-out-of-bounds in init_smb2_rsp_hdr\n\nWhen smb1 mount fails, KASAN detect slab-out-of-bounds in\ninit_smb2_rsp_hdr like the following one.\nFor smb1 negotiate(56bytes) , init_smb2_rsp_hdr() for smb2 is called.\nThe issue occurs while handling smb1 negotiate as smb2 server operations.\nAdd smb server operations for smb1 (get_cmd_val, init_rsp_hdr,\nallocate_rsp_buf, check_user_session) to handle smb1 negotiate so that\nsmb2 server operation does not handle it.\n\n[  411.400423] CIFS: VFS: Use of the less secure dialect vers=1.0 is\nnot recommended unless required for access to very old servers\n[  411.400452] CIFS: Attempting to mount \\\\192.168.45.139\\homes\n[  411.479312] ksmbd: init_smb2_rsp_hdr : 492\n[  411.479323] ==================================================================\n[  411.479327] BUG: KASAN: slab-out-of-bounds in\ninit_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd]\n[  411.479369] Read of size 16 at addr ffff888488ed0734 by task kworker/14:1/199\n\n[  411.479379] CPU: 14 PID: 199 Comm: kworker/14:1 Tainted: G\n OE      6.1.21 #3\n[  411.479386] Hardware name: ASUSTeK COMPUTER INC. Z10PA-D8\nSeries/Z10PA-D8 Series, BIOS 3801 08/23/2019\n[  411.479390] Workqueue: ksmbd-io handle_ksmbd_work [ksmbd]\n[  411.479425] Call Trace:\n[  411.479428]  <TASK>\n[  411.479432]  dump_stack_lvl+0x49/0x63\n[  411.479444]  print_report+0x171/0x4a8\n[  411.479452]  ? kasan_complete_mode_report_info+0x3c/0x200\n[  411.479463]  ? init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd]\n[  411.479497]  kasan_report+0xb4/0x130\n[  411.479503]  ? init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd]\n[  411.479537]  kasan_check_range+0x149/0x1e0\n[  411.479543]  memcpy+0x24/0x70\n[  411.479550]  init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd]\n[  411.479585]  handle_ksmbd_work+0x109/0x760 [ksmbd]\n[  411.479616]  ? _raw_spin_unlock_irqrestore+0x50/0x50\n[  411.479624]  ? smb3_encrypt_resp+0x340/0x340 [ksmbd]\n[  411.479656]  process_one_work+0x49c/0x790\n[  411.479667]  worker_thread+0x2b1/0x6e0\n[  411.479674]  ? process_one_work+0x790/0x790\n[  411.479680]  kthread+0x177/0x1b0\n[  411.479686]  ? kthread_complete_and_exit+0x30/0x30\n[  411.479692]  ret_from_fork+0x22/0x30\n[  411.479702]  </TASK>","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","score":9.1},"cwes":[],"references":["https://git.kernel.org/stable/c/921536046bd165efeb07beef5630aff35cd6a489","https://git.kernel.org/stable/c/99a51c673b1d2d0b5a972353401b77612d9cc713","https://git.kernel.org/stable/c/a8334a0c535d0f0b4d64926c8fe0922ed98f7d43","https://git.kernel.org/stable/c/dc8289f912387c3bcfbc5d2db29c8947fa207c11"],"products":[],"source":"nvd","synced_at":"2026-10-28T19:37:43.506563291+00:00"},"epss":{"cve":"CVE-2023-54203","score":0.00548,"percentile":0.45758,"date":"2026-10-28"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}