{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-90174", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-90174", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-17T16:07:01.106Z", "updatedAt": "2026-10-21T12:50:17.993Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ksmbd: fix slab-out-of-bounds read in ksmbd_alloc_user()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slab-out-of-bounds read in ksmbd_alloc_user()\n\nksmbd_alloc_user() copies resp->hash_sz bytes out of the mountd IPC\nlogin response with\n\n\tuser->passkey_sz = resp->hash_sz;\n\tuser->passkey = kmalloc(resp->hash_sz, KSMBD_DEFAULT_GFP);\n\tif (user->passkey)\n\t\tmemcpy(user->passkey, resp->hash, resp->hash_sz);\n\nresp->hash_sz is a __u16 supplied by the response, but resp->hash[] is\nonly KSMBD_REQ_MAX_HASH_SZ bytes. A malformed or malicious login\nresponse can set hash_sz well beyond that (up to 65535), so the memcpy()\nreads past the end of the response object. ipc_validate_msg() does not\nbound hash_sz, so reject any response whose hash_sz exceeds the on-stack\nhash[] buffer before allocating and copying.\n\n[ 2030.238706] BUG: KASAN: slab-out-of-bounds in ksmbd_alloc_user+0x278/0x680\n[ 2030.240549] Read of size 65535 at addr ffff888121bb6680 by task kworker/4:1/18611\n[ 2030.242296]\n[ 2030.242710] CPU: 4 UID: 0 PID: 18611 Comm: kworker/4:1 Not tainted 7.1.0-next-20260623-virtme #96 PREEMPT(lazy)\n[ 2030.242732] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n[ 2030.242743] Workqueue: ksmbd-io handle_ksmbd_work\n[ 2030.242763] Call Trace:\n[ 2030.242769] \n[ 2030.242776] dump_stack_lvl+0xa2/0xd0\n[ 2030.242794] print_address_description+0x77/0x200\n[ 2030.242815] ? ksmbd_alloc_user+0x278/0x680\n[ 2030.242831] print_report+0x58/0x70\n[ 2030.242848] kasan_report+0x117/0x150\n[ 2030.242869] ? ksmbd_alloc_user+0x278/0x680\n[ 2030.242888] kasan_check_range+0x3c7/0x3f0\n[ 2030.242908] ? ksmbd_alloc_user+0x278/0x680\n[ 2030.242925] __asan_memcpy+0x29/0x70\n[ 2030.242942] ksmbd_alloc_user+0x278/0x680\n[ 2030.242960] ksmbd_login_user+0xc3/0x120\n[ 2030.242978] ntlm_authenticate+0x5e6/0x1b00\n[ 2030.243017] ? __pfx_ntlm_authenticate+0x10/0x10\n[ 2030.243035] ? ksmbd_session_lookup+0x188/0x1d0\n[ 2030.243054] ? __pfx_ksmbd_session_lookup+0x10/0x10\n[ 2030.243090] ? __sanitizer_cov_trace_switch+0x7b/0x140\n[ 2030.243108] smb2_sess_setup+0x1e4a/0x27b0\n[ 2030.243126] ? copy_from_kernel_nofault+0x199/0x300\n[ 2030.243156] ? __pfx_smb2_sess_setup+0x10/0x10\n[ 2030.243173] ? get_smb2_cmd_val+0xe3/0x1c0\n[ 2030.243208] handle_ksmbd_work+0x954/0x1280\n[ 2030.243230] ? __pfx_handle_ksmbd_work+0x10/0x10\n[ 2030.243249] ? process_scheduled_works+0xa07/0x1490\n[ 2030.243270] ? process_scheduled_works+0xa07/0x1490\n[ 2030.243291] process_scheduled_works+0xa70/0x1490\n[ 2030.243320] ? __pfx_process_scheduled_works+0x10/0x10\n[ 2030.243340] ? do_raw_spin_lock+0x130/0x300\n[ 2030.243358] ? lock_is_held_type+0x7b/0x110\n[ 2030.243388] worker_thread+0x932/0xe20\n[ 2030.243415] kthread+0x38a/0x470\n[ 2030.243431] ? __pfx_worker_thread+0x10/0x10\n[ 2030.243451] ? __pfx_kthread+0x10/0x10\n[ 2030.243467] ret_from_fork+0x484/0x910\n[ 2030.243485] ? __pfx_ret_from_fork+0x10/0x10\n[ 2030.243501] ? __switch_to+0xc77/0x12c0\n[ 2030.243523] ? __pfx_kthread+0x10/0x10\n[ 2030.243540] ret_from_fork_asm+0x1a/0x30\n[ 2030.243564] \n[ 2030.243570]\n[ 2030.290164] Allocated by task 19279:\n[ 2030.290911] kasan_save_track+0x3e/0x80\n[ 2030.292179] __kasan_kmalloc+0x72/0x90\n[ 2030.293217] __kvmalloc_node_noprof+0x3ff/0x6b0\n[ 2030.294467] handle_generic_event+0x59b/0x750\n[ 2030.295345] genl_family_rcv_msg_doit+0x238/0x340\n[ 2030.296553] genl_rcv_msg+0x606/0x7b0\n[ 2030.297129] netlink_rcv_skb+0x22b/0x4a0\n[ 2030.298500] genl_rcv+0x2d/0x40\n[ 2030.299273] netlink_unicast+0x7ba/0x930\n[ 2030.300019] netlink_sendmsg+0x8c3/0xb00\n[ 2030.301073] __sock_sendmsg+0xec/0x140\n[ 2030.301579] __sys_sendto+0x357/0x470\n[ 2030.302255] __x64_sys_sendto+0xe3/0x100\n[ 2030.303425] do_syscall_64+0x135/0x460\n[ 2030.304763] entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[ 2030.305594]\n[ 2030.305819] The buggy address belongs to the object at ffff888121bb6640\n[ 2030.305819] which belongs to the cache kmalloc-192 of size 192\n[ 2030.309595] The buggy address \n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "status": "affected", "versionType": "git", "lessThan": "67223b1150a9edea52350d8cd085ea9081beaa45" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "status": "affected", "versionType": "git", "lessThan": "863f74ad158fef2987b9146f29d4b3149bb95953" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "status": "affected", "versionType": "git", "lessThan": "272c05a51285fe3495ab2f7eb77a48ad831b929f" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "status": "affected", "versionType": "git", "lessThan": "497c221bf6b2f659511719a6acfae84cc1be1caf" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "status": "affected", "versionType": "git", "lessThan": "7405d0ba294306721843bc551611775e6edef516" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.15" }, { "version": "6.6.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.114", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.57", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }