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Copyright ยฉ 2026 HOL DAO LLC. All rights reserved.

Back to active CVEs
High ยท CVSS 7.1CVE-2026-90174

ksmbd: fix slab-out-of-bounds read in ksmbd_alloc_user()CVE-2026-90174

Answer in brief

CVE-2026-90174 records a High severity (CVSS 7.1) vulnerability in ksmbd: fix slab-out-of-bounds read in ksmbd_alloc_user(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Oct 30, 2026Source checked Nov 1, 2026First seen by HOL Sep 17, 2026Material review Oct 30, 2026
Upstream Advisory

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 1, 2026
References
6 linked sources
Open source record

Key facts

Risk
High ยท CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <497c221bf6b2f659511719a6acfae84cc1be1caf || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <7405d0ba294306721843bc551611775e6edef516497c221bf6b2f659511719a6acfae84cc1be1caf, 7405d0ba294306721843bc551611775e6edef516
Linux/Linuxgeneric5.15Not reported
Linux/Linuxgeneric>=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <272c05a51285fe3495ab2f7eb77a48ad831b929f || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <497c221bf6b2f659511719a6acfae84cc1be1caf || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <7405d0ba294306721843bc551611775e6edef516272c05a51285fe3495ab2f7eb77a48ad831b929f, 497c221bf6b2f659511719a6acfae84cc1be1caf, 7405d0ba294306721843bc551611775e6edef516
Linux/Linuxgeneric>=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <67223b1150a9edea52350d8cd085ea9081beaa45 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <863f74ad158fef2987b9146f29d4b3149bb95953 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <272c05a51285fe3495ab2f7eb77a48ad831b929f || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <497c221bf6b2f659511719a6acfae84cc1be1caf || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <7405d0ba294306721843bc551611775e6edef51667223b1150a9edea52350d8cd085ea9081beaa45, 863f74ad158fef2987b9146f29d4b3149bb95953, 272c05a51285fe3495ab2f7eb77a48ad831b929f, 497c221bf6b2f659511719a6acfae84cc1be1caf, 7405d0ba294306721843bc551611775e6edef516
Linux/Linuxgeneric>=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <792dd35013427995e742c7928ef5b564434a4321 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <67223b1150a9edea52350d8cd085ea9081beaa45 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <863f74ad158fef2987b9146f29d4b3149bb95953 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <272c05a51285fe3495ab2f7eb77a48ad831b929f || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <497c221bf6b2f659511719a6acfae84cc1be1caf || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <7405d0ba294306721843bc551611775e6edef516792dd35013427995e742c7928ef5b564434a4321, 67223b1150a9edea52350d8cd085ea9081beaa45, 863f74ad158fef2987b9146f29d4b3149bb95953, 272c05a51285fe3495ab2f7eb77a48ad831b929f, 497c221bf6b2f659511719a6acfae84cc1be1caf, 7405d0ba294306721843bc551611775e6edef516

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 497c221bf6b2f659511719a6acfae84cc1be1caf; Linux/Linux to 272c05a51285fe3495ab2f7eb77a48ad831b929f; Linux/Linux to 67223b1150a9edea52350d8cd085ea9081beaa45; Linux/Linux to 792dd35013427995e742c7928ef5b564434a4321 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 17, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds read in ksmbd_alloc_user() ksmbd_alloc_user() copies resp->hash_sz bytes out of the mountd IPC login response with user->passkey_sz = resp->hash_sz; user->passkey = kmalloc(resp->hash_sz, KSMBD_DEFAULT_GFP); if (user->passkey) memcpy(user->passkey, resp->hash, resp->hash_sz); resp->hash_sz is a __u16 supplied by the response, but resp->hash[] is only KSMBD_REQ_MAX_HASH_SZ bytes. A malformed or malicious login response can set hash_sz well beyond that (up to 65535), so the memcpy() reads past the end of the response object. ipc_validate_msg() does not bound hash_sz, so reject any response whose hash_sz exceeds the on-stack hash[] buffer before allocating and copying. [ 2030.238706] BUG: KASAN: slab-out-of-bounds in ksmbd_alloc_user+0x278/0x680 [ 2030.240549] Read of size 65535 at addr ffff888121bb6680 by task kworker/4:1/18611 [ 2030.242296] [ 2030.242710] CPU: 4 UID: 0 PID: 18611 Comm: kworker/4:1 Not tainted 7.1.0-next-20260623-virtme #96 PREEMPT(lazy) [ 2030.242732] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 [ 2030.242743] Workqueue: ksmbd-io handle_ksmbd_work [ 2030.242763] Call Trace: [ 2030.242769] <TASK> [ 2030.242776] dump_stack_lvl+0xa2/0xd0 [ 2030.242794] print_address_description+0x77/0x200 [ 2030.242815] ? ksmbd_alloc_user+0x278/0x680 [ 2030.242831] print_report+0x58/0x70 [ 2030.242848] kasan_report+0x117/0x150 [ 2030.242869] ? ksmbd_alloc_user+0x278/0x680 [ 2030.242888] kasan_check_range+0x3c7/0x3f0 [ 2030.242908] ? ksmbd_alloc_user+0x278/0x680 [ 2030.242925] __asan_memcpy+0x29/0x70 [ 2030.242942] ksmbd_alloc_user+0x278/0x680 [ 2030.242960] ksmbd_login_user+0xc3/0x120 [ 2030.242978] ntlm_authenticate+0x5e6/0x1b00 [ 2030.243017] ? __pfx_ntlm_authenticate+0x10/0x10 [ 2030.243035] ? ksmbd_session_lookup+0x188/0x1d0 [ 2030.243054] ? __pfx_ksmbd_session_lookup+0x10/0x10 [ 2030.243090] ? __sanitizer_cov_trace_switch+0x7b/0x140 [ 2030.243108] smb2_sess_setup+0x1e4a/0x27b0 [ 2030.243126] ? copy_from_kernel_nofault+0x199/0x300 [ 2030.243156] ? __pfx_smb2_sess_setup+0x10/0x10 [ 2030.243173] ? get_smb2_cmd_val+0xe3/0x1c0 [ 2030.243208] handle_ksmbd_work+0x954/0x1280 [ 2030.243230] ? __pfx_handle_ksmbd_work+0x10/0x10 [ 2030.243249] ? process_scheduled_works+0xa07/0x1490 [ 2030.243270] ? process_scheduled_works+0xa07/0x1490 [ 2030.243291] process_scheduled_works+0xa70/0x1490 [ 2030.243320] ? __pfx_process_scheduled_works+0x10/0x10 [ 2030.243340] ? do_raw_spin_lock+0x130/0x300 [ 2030.243358] ? lock_is_held_type+0x7b/0x110 [ 2030.243388] worker_thread+0x932/0xe20 [ 2030.243415] kthread+0x38a/0x470 [ 2030.243431] ? __pfx_worker_thread+0x10/0x10 [ 2030.243451] ? __pfx_kthread+0x10/0x10 [ 2030.243467] ret_from_fork+0x484/0x910 [ 2030.243485] ? __pfx_ret_from_fork+0x10/0x10 [ 2030.243501] ? __switch_to+0xc77/0x12c0 [ 2030.243523] ? __pfx_kthread+0x10/0x10 [ 2030.243540] ret_from_fork_asm+0x1a/0x30 [ 2030.243564] </TASK> [ 2030.243570] [ 2030.290164] Allocated by task 19279: [ 2030.290911] kasan_save_track+0x3e/0x80 [ 2030.292179] __kasan_kmalloc+0x72/0x90 [ 2030.293217] __kvmalloc_node_noprof+0x3ff/0x6b0 [ 2030.294467] handle_generic_event+0x59b/0x750 [ 2030.295345] genl_family_rcv_msg_doit+0x238/0x340 [ 2030.296553] genl_rcv_msg+0x606/0x7b0 [ 2030.297129] netlink_rcv_skb+0x22b/0x4a0 [ 2030.298500] genl_rcv+0x2d/0x40 [ 2030.299273] netlink_unicast+0x7ba/0x930 [ 2030.300019] netlink_sendmsg+0x8c3/0xb00 [ 2030.301073] __sock_sendmsg+0xec/0x140 [ 2030.301579] __sys_sendto+0x357/0x470 [ 2030.302255] __x64_sys_sendto+0xe3/0x100 [ 2030.303425] do_syscall_64+0x135/0x460 [ 2030.304763] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 2030.305594] [ 2030.305819] The buggy address belongs to the object at ffff888121bb6640 [ 2030.305819] which belongs to the cache kmalloc-192 of size 192 [ 2030.309595] The buggy address ---truncated---

Quoted source text, attributed separately from HOL analysis.