164 lines
11 KiB
JSON
164 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-54203",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-12-30T12:06:44.499Z",
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"datePublished": "2025-12-30T12:09:07.538Z",
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"dateUpdated": "2026-08-05T09:18:01.954Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:18:01.954Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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>"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the vulnerable `init_smb2_rsp_hdr()` is reached directly from `ksmbd_conn_handler_loop()` processing bytes received from a remote peer. No local access is involved.\nAC:L - The attacker simply opens a TCP connection and sends one crafted SMB1-protocol PDU with a short RFC1002 length; the 16-byte read at fixed offset 52-68 occurs deterministically with no race and no dependence on conditions outside the attacker's control (the attacker even picks the allocation size, hence the slab bucket).\nPR:N - The defect triggers on the very first packet of a connection, in `init_rsp_hdr()` which runs before `ksmbd_verify_smb_message()`, before negotiate completes and before any session setup or credential validation. No authentication whatsoever is required.\nUI:N - The attacker drives the entire exchange by connecting to the SMB port and sending a packet; no action by any local user or administrator is needed.\nS:U - The out-of-bounds read and its consequences are confined to the kernel's own memory and the ksmbd server's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - 16 bytes of adjacent kernel slab memory are memcpy'd into the response Signature field and transmitted back to the unauthenticated attacker via `ksmbd_conn_write()` (response length 64 includes offsets 52-68), and the attacker chooses `pdu_size` to select the slab cache and read distance — a repeatable, groomable disclosure of kernel heap contents including pointers and neighbouring session data.\nI:N - The defect is a read past the end of the request buffer; all writes (the response header memset/memcpy) stay within the 448-byte response allocation, so no out-of-bounds write or kernel data modification primitive exists.\nA:H - The read runs off the end of a tiny attacker-sized kmalloc object and is reported by KASAN as shown in the commit (a panic on `panic_on_warn` kernels), and on KFENCE/DEBUG_PAGEALLOC-enabled distro kernels it can fault on a guard page, oopsing the ksmbd workqueue thread; the attacker can retry indefinitely pre-authentication to hit that condition."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ksmbd/server.c",
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"fs/ksmbd/smb2pdu.c",
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"fs/ksmbd/smb_common.c",
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"fs/ksmbd/smb_common.h"
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],
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"versions": [
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{
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"version": "51a8534c0f35c0401e45f1055f914729cad98bf9",
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"lessThan": "921536046bd165efeb07beef5630aff35cd6a489",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0b3ec5671ac06829ccebdaeec05acedfec327f42",
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"lessThan": "a8334a0c535d0f0b4d64926c8fe0922ed98f7d43",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cc32cd98a0aee4cc3eb611cbce11795b1aaa738a",
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"lessThan": "99a51c673b1d2d0b5a972353401b77612d9cc713",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "39b291b86b5988bf8753c3874d5c773399d09b96",
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"lessThan": "dc8289f912387c3bcfbc5d2db29c8947fa207c11",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ksmbd/server.c",
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"fs/ksmbd/smb2pdu.c",
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"fs/ksmbd/smb_common.c",
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"fs/ksmbd/smb_common.h"
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],
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"versions": [
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{
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"version": "5.15.105",
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"lessThan": "5.15.145",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.22",
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"lessThan": "6.1.24",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.2.9",
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"lessThan": "6.2.11",
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"status": "affected",
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"versionType": "semver"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15.105",
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"versionEndExcluding": "5.15.145"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.22",
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"versionEndExcluding": "6.1.24"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2.9",
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"versionEndExcluding": "6.2.11"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/921536046bd165efeb07beef5630aff35cd6a489"
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},
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{
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"url": "https://git.kernel.org/stable/c/a8334a0c535d0f0b4d64926c8fe0922ed98f7d43"
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},
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{
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"url": "https://git.kernel.org/stable/c/99a51c673b1d2d0b5a972353401b77612d9cc713"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc8289f912387c3bcfbc5d2db29c8947fa207c11"
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}
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],
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"title": "ksmbd: fix slab-out-of-bounds in init_smb2_rsp_hdr",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |