GHSA-92H7-9RVH-996H
Vulnerability from github – Published: 2025-12-30 15:30 – Updated: 2026-08-04 12:34In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix slab-out-of-bounds in init_smb2_rsp_hdr
When smb1 mount fails, KASAN detect slab-out-of-bounds in init_smb2_rsp_hdr like the following one. For smb1 negotiate(56bytes) , init_smb2_rsp_hdr() for smb2 is called. The issue occurs while handling smb1 negotiate as smb2 server operations. Add smb server operations for smb1 (get_cmd_val, init_rsp_hdr, allocate_rsp_buf, check_user_session) to handle smb1 negotiate so that smb2 server operation does not handle it.
[ 411.400423] CIFS: VFS: Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers [ 411.400452] CIFS: Attempting to mount \192.168.45.139\homes [ 411.479312] ksmbd: init_smb2_rsp_hdr : 492 [ 411.479323] ================================================================== [ 411.479327] BUG: KASAN: slab-out-of-bounds in init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd] [ 411.479369] Read of size 16 at addr ffff888488ed0734 by task kworker/14:1/199
[ 411.479379] CPU: 14 PID: 199 Comm: kworker/14:1 Tainted: G OE 6.1.21 #3 [ 411.479386] Hardware name: ASUSTeK COMPUTER INC. Z10PA-D8 Series/Z10PA-D8 Series, BIOS 3801 08/23/2019 [ 411.479390] Workqueue: ksmbd-io handle_ksmbd_work [ksmbd] [ 411.479425] Call Trace: [ 411.479428] [ 411.479432] dump_stack_lvl+0x49/0x63 [ 411.479444] print_report+0x171/0x4a8 [ 411.479452] ? kasan_complete_mode_report_info+0x3c/0x200 [ 411.479463] ? init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd] [ 411.479497] kasan_report+0xb4/0x130 [ 411.479503] ? init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd] [ 411.479537] kasan_check_range+0x149/0x1e0 [ 411.479543] memcpy+0x24/0x70 [ 411.479550] init_smb2_rsp_hdr+0x1e2/0x1f4 [ksmbd] [ 411.479585] handle_ksmbd_work+0x109/0x760 [ksmbd] [ 411.479616] ? _raw_spin_unlock_irqrestore+0x50/0x50 [ 411.479624] ? smb3_encrypt_resp+0x340/0x340 [ksmbd] [ 411.479656] process_one_work+0x49c/0x790 [ 411.479667] worker_thread+0x2b1/0x6e0 [ 411.479674] ? process_one_work+0x790/0x790 [ 411.479680] kthread+0x177/0x1b0 [ 411.479686] ? kthread_complete_and_exit+0x30/0x30 [ 411.479692] ret_from_fork+0x22/0x30 [ 411.479702]
{
"affected": [],
"aliases": [
"CVE-2023-54203"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-30T13:16:08Z",
"severity": "CRITICAL"
},
"details": "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] \u003cTASK\u003e\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] \u003c/TASK\u003e",
"id": "GHSA-92h7-9rvh-996h",
"modified": "2026-08-04T12:34:48Z",
"published": "2025-12-30T15:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-54203"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/921536046bd165efeb07beef5630aff35cd6a489"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/99a51c673b1d2d0b5a972353401b77612d9cc713"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a8334a0c535d0f0b4d64926c8fe0922ed98f7d43"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc8289f912387c3bcfbc5d2db29c8947fa207c11"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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