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vuln-cve/data/2026/90xxx/CVE-2026-90170.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-90170",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.790Z",
"datePublished": "2026-09-17T16:06:58.486Z",
"dateUpdated": "2026-10-30T12:34:35.628Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:34:35.628Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate ipc response length before dereferencing its fields\n\nipc_validate_msg() computes the expected message size by reading length\nfields out of the response buffer supplied by the userspace ksmbd daemon\n(payload_sz, session_key_len, ngroups, ...). Those fields are read before\nthe buffer is verified to be large enough to contain the struct they belong\nto, so a short response makes the read land past the end of the allocation.\n\nhandle_response() sizes entry->response purely from the netlink attribute\nlength (nla_len()) and only guards the leading handle read, so the daemon\ncan install a response as small as the kmalloc-8 object seen below. When\nipc_msg_send_request() then calls ipc_validate_msg() for a\nKSMBD_EVENT_RPC_REQUEST, the cast to struct ksmbd_rpc_command reads\nresp->payload_sz at offset 8 of an 8-byte allocation:\n\n[ 3697.841381] ==================================================================\n[ 3697.844099] BUG: KASAN: slab-out-of-bounds in ipc_msg_send_request+0x763/0x800\n[ 3697.846604] Read of size 4 at addr ffff888105f95910 by task kworker/4:3/20682\n[ 3697.849061]\n[ 3697.849801] CPU: 4 UID: 0 PID: 20682 Comm: kworker/4:3 Not tainted 7.2.0-rc3-next-20260717-virtme #117 PREEMPT(lazy)\n[ 3697.850077] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n[ 3697.850303] Workqueue: ksmbd-io handle_ksmbd_work\n[ 3697.850592] Call Trace:\n[ 3697.850794] <TASK>\n[ 3697.850952] __dump_stack+0x21/0x60\n[ 3697.851239] dump_stack_lvl+0xc2/0x100\n[ 3697.851528] print_address_description+0x77/0x200\n[ 3697.851816] ? ipc_msg_send_request+0x763/0x800\n[ 3697.852024] print_report+0x58/0x70\n[ 3697.852316] kasan_report+0x117/0x150\n[ 3697.852585] ? down_write+0x146/0x1f0\n[ 3697.852809] ? ipc_msg_send_request+0x763/0x800\n[ 3697.853082] ipc_msg_send_request+0x763/0x800\n[ 3697.853385] ? __pfx_ipc_msg_send_request+0x10/0x10\n[ 3697.853604] ? kasan_unpoison+0x48/0x70\n[ 3697.853936] ? __pfx___up_read+0x10/0x10\n[ 3697.854221] ksmbd_rpc_ioctl+0x380/0x520\n[ 3697.854542] ? __pfx_ksmbd_rpc_ioctl+0x10/0x10\n[ 3697.854757] ? kasan_unpoison+0x48/0x70\n[ 3697.854962] ? copy_from_kernel_nofault+0x32c/0x4e0\n[ 3697.855166] ? kasan_unpoison+0x48/0x70\n[ 3697.855416] fsctl_pipe_transceive+0x139/0x7a0\n[ 3697.855705] ? __pfx_copy_from_kernel_nofault+0x10/0x10\n[ 3697.855937] ? __pfx_fsctl_pipe_transceive+0x10/0x10\n[ 3697.856388] ? __sanitizer_cov_trace_switch+0x7b/0x140\n[ 3697.856620] smb2_ioctl+0x1141/0x3420\n[ 3697.856994] ? __pfx_smb2_ioctl+0x10/0x10\n[ 3697.857182] ? get_smb2_cmd_val+0xe3/0x1c0\n[ 3697.857655] handle_ksmbd_work+0x9ad/0x15e0\n[ 3697.858034] ? __pfx_handle_ksmbd_work+0x10/0x10\n[ 3697.858251] ? lock_release+0xf7/0x360\n[ 3697.858466] ? process_scheduled_works+0x954/0x1600\n[ 3697.858698] ? process_scheduled_works+0x954/0x1600\n[ 3697.858905] process_scheduled_works+0xc22/0x1600\n[ 3697.859368] ? __pfx_process_scheduled_works+0x10/0x10\n[ 3697.859637] ? __pfx_assign_work+0x10/0x10\n[ 3697.859896] ? lock_is_held_type+0x7b/0x110\n[ 3697.860146] worker_thread+0x975/0xee0\n[ 3697.860524] ? __pfx_do_raw_spin_lock+0x10/0x10\n[ 3697.860830] ? __kthread_parkme+0x21e/0x260\n[ 3697.861105] kthread+0x3a6/0x490\n[ 3697.861423] ? __pfx_worker_thread+0x10/0x10\n[ 3697.861643] ? __pfx_kthread+0x10/0x10\n[ 3697.861878] ret_from_fork+0x55a/0xa20\n[ 3697.862194] ? __pfx_ret_from_fork+0x10/0x10\n[ 3697.862480] ? __pfx_kthread+0x10/0x10\n[ 3697.862714] ret_from_fork_asm+0x1a/0x30\n[ 3697.862965] </TASK>\n[ 3697.863039]\n[ 3697.938882] Allocated by task 20761:\n[ 3697.940257] kasan_save_track+0x3e/0x80\n[ 3697.941782] __kasan_kmalloc+0x72/0x90\n[ 3697.943228] __kvmalloc_node_noprof+0x3e9/0x6a0\n[ 3697.944948] handle_generic_event+0x59b/0x750\n[ 3697.946592] genl_family_rcv_msg_doit+0x3d6/0x560\n[ 3697.946977] genl_rcv_msg+0x67c/0x900\n[ 3697.947224] netlink_rcv_skb+0x286/0x580\n[ 3697.947488] genl_rcv+0x2d/0x80\n[ 3\n---truncated---"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/smb/server/transport_ipc.c"
],
"versions": [
{
"version": "bf396208418371174869baba9434535cd3288e80",
"lessThan": "17b7d1a2b4d5473df5dca8c9a07d65021806c23a",
"status": "affected",
"versionType": "git"
},
{
"version": "7dd0c858e1909769a4c91842724315ee74f1a5f1",
"lessThan": "398cba4b646a6c08ff3d79e6b1e70e5ddae8a065",
"status": "affected",
"versionType": "git"
},
{
"version": "299db777ea0cfa5c407e41b045c24a14c034c27b",
"lessThan": "0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595",
"status": "affected",
"versionType": "git"
},
{
"version": "d6a6aa81eac2c9bff66dc6e191179cb69a14426b",
"lessThan": "c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52",
"status": "affected",
"versionType": "git"
},
{
"version": "d6a6aa81eac2c9bff66dc6e191179cb69a14426b",
"lessThan": "e9b33376bd07bca4175f7bcc2d6034ef250f8181",
"status": "affected",
"versionType": "git"
},
{
"version": "52518503a1a00bc33e9522c4eb05df023e3ae978",
"status": "affected",
"versionType": "git"
},
{
"version": "99c631d0366c1eab8fb188fe66425f4581ebdde4",
"status": "affected",
"versionType": "git"
},
{
"version": "6.6.141",
"lessThan": "6.6.157",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.12.84",
"lessThan": "6.12.110",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.18.25",
"lessThan": "6.18.52",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThan": "6.2",
"status": "affected",
"versionType": "semver"
},
{
"version": "7.0.2",
"lessThan": "7.1",
"status": "affected",
"versionType": "semver"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/smb/server/transport_ipc.c"
],
"versions": [
{
"version": "7.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "7.1",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.6",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.141",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.12.84",
"versionEndExcluding": "6.12.110"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.18.25",
"versionEndExcluding": "6.18.52"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.1",
"versionEndExcluding": "7.2.6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.1",
"versionEndExcluding": "7.3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.0.2"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/17b7d1a2b4d5473df5dca8c9a07d65021806c23a"
},
{
"url": "https://git.kernel.org/stable/c/398cba4b646a6c08ff3d79e6b1e70e5ddae8a065"
},
{
"url": "https://git.kernel.org/stable/c/0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595"
},
{
"url": "https://git.kernel.org/stable/c/c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52"
},
{
"url": "https://git.kernel.org/stable/c/e9b33376bd07bca4175f7bcc2d6034ef250f8181"
}
],
"title": "ksmbd: validate ipc response length before dereferencing its fields",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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