{"schema_version":"1.9.0","id":"CVE-2023-54170","published":"2025-12-30T12:08:44.763Z","modified":"2026-08-12T03:51:12.766555554Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0278-1","SUSE-SU-2026:0281-1","SUSE-SU-2026:0293-1","SUSE-SU-2026:0315-1","SUSE-SU-2026:0316-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0350-1","SUSE-SU-2026:0369-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0617-1","SUSE-SU-2026:20477-1","SUSE-SU-2026:20498-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1"],"summary":"keys: Fix linking a duplicate key to a keyring's assoc_array","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Fix linking a duplicate key to a keyring's assoc_array\n\nWhen making a DNS query inside the kernel using dns_query(), the request\ncode can in rare cases end up creating a duplicate index key in the\nassoc_array of the destination keyring. It is eventually found by\na BUG_ON() check in the assoc_array implementation and results in\na crash.\n\nExample report:\n[2158499.700025] kernel BUG at ../lib/assoc_array.c:652!\n[2158499.700039] invalid opcode: 0000 [#1] SMP PTI\n[2158499.700065] CPU: 3 PID: 31985 Comm: kworker/3:1 Kdump: loaded Not tainted 5.3.18-150300.59.90-default #1 SLE15-SP3\n[2158499.700096] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020\n[2158499.700351] Workqueue: cifsiod cifs_resolve_server [cifs]\n[2158499.700380] RIP: 0010:assoc_array_insert+0x85f/0xa40\n[2158499.700401] Code: ff 74 2b 48 8b 3b 49 8b 45 18 4c 89 e6 48 83 e7 fe e8 95 ec 74 00 3b 45 88 7d db 85 c0 79 d4 0f 0b 0f 0b 0f 0b e8 41 f2 be ff <0f> 0b 0f 0b 81 7d 88 ff ff ff 7f 4c 89 eb 4c 8b ad 58 ff ff ff 0f\n[2158499.700448] RSP: 0018:ffffc0bd6187faf0 EFLAGS: 00010282\n[2158499.700470] RAX: ffff9f1ea7da2fe8 RBX: ffff9f1ea7da2fc1 RCX: 0000000000000005\n[2158499.700492] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000\n[2158499.700515] RBP: ffffc0bd6187fbb0 R08: ffff9f185faf1100 R09: 0000000000000000\n[2158499.700538] R10: ffff9f1ea7da2cc0 R11: 000000005ed8cec8 R12: ffffc0bd6187fc28\n[2158499.700561] R13: ffff9f15feb8d000 R14: ffff9f1ea7da2fc0 R15: ffff9f168dc0d740\n[2158499.700585] FS:  0000000000000000(0000) GS:ffff9f185fac0000(0000) knlGS:0000000000000000\n[2158499.700610] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[2158499.700630] CR2: 00007fdd94fca238 CR3: 0000000809d8c006 CR4: 00000000003706e0\n[2158499.700702] Call Trace:\n[2158499.700741]  ? key_alloc+0x447/0x4b0\n[2158499.700768]  ? __key_link_begin+0x43/0xa0\n[2158499.700790]  __key_link_begin+0x43/0xa0\n[2158499.700814]  request_key_and_link+0x2c7/0x730\n[2158499.700847]  ? dns_resolver_read+0x20/0x20 [dns_resolver]\n[2158499.700873]  ? key_default_cmp+0x20/0x20\n[2158499.700898]  request_key_tag+0x43/0xa0\n[2158499.700926]  dns_query+0x114/0x2ca [dns_resolver]\n[2158499.701127]  dns_resolve_server_name_to_ip+0x194/0x310 [cifs]\n[2158499.701164]  ? scnprintf+0x49/0x90\n[2158499.701190]  ? __switch_to_asm+0x40/0x70\n[2158499.701211]  ? __switch_to_asm+0x34/0x70\n[2158499.701405]  reconn_set_ipaddr_from_hostname+0x81/0x2a0 [cifs]\n[2158499.701603]  cifs_resolve_server+0x4b/0xd0 [cifs]\n[2158499.701632]  process_one_work+0x1f8/0x3e0\n[2158499.701658]  worker_thread+0x2d/0x3f0\n[2158499.701682]  ? process_one_work+0x3e0/0x3e0\n[2158499.701703]  kthread+0x10d/0x130\n[2158499.701723]  ? kthread_park+0xb0/0xb0\n[2158499.701746]  ret_from_fork+0x1f/0x40\n\nThe situation occurs as follows:\n* Some kernel facility invokes dns_query() to resolve a hostname, for\n  example, \"abcdef\". The function registers its global DNS resolver\n  cache as current->cred.thread_keyring and passes the query to\n  request_key_net() -> request_key_tag() -> request_key_and_link().\n* Function request_key_and_link() creates a keyring_search_context\n  object. Its match_data.cmp method gets set via a call to\n  type->match_preparse() (resolves to dns_resolver_match_preparse()) to\n  dns_resolver_cmp().\n* Function request_key_and_link() continues and invokes\n  search_process_keyrings_rcu() which returns that a given key was not\n  found. The control is then passed to request_key_and_link() ->\n  construct_alloc_key().\n* Concurrently to that, a second task similarly makes a DNS query for\n  \"abcdef.\" and its result gets inserted into the DNS resolver cache.\n* Back on the first task, function construct_alloc_key() first runs\n  __key_link_begin() to determine an assoc_array_edit operation to\n  insert a new key. Index keys in the array are compared exactly as-is,\n  using keyring_compare_object(). The operation \n---truncated---","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"df593ee23e05cdda16c8c995e5818779431bb29f"},{"fixed":"65bd66a794bfa059375ec834885bb610d75c0182"},{"fixed":"0a6b0ca58685be34979236f83f2b322635b80b32"},{"fixed":"9aecfebea24fe6071ace5cc9fd6d690b87276bbb"},{"fixed":"00edfa6d4fe022942e2f2e6f3294ff13ef78b15c"},{"fixed":"e091bb55af9a930801f83df78195a908a76e1479"},{"fixed":"d55901522f96082a43b9842d34867363c0cdbac5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54170.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"5.4.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.123"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.4.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54170.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00edfa6d4fe022942e2f2e6f3294ff13ef78b15c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0a6b0ca58685be34979236f83f2b322635b80b32"},{"type":"WEB","url":"https://git.kernel.org/stable/c/65bd66a794bfa059375ec834885bb610d75c0182"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9aecfebea24fe6071ace5cc9fd6d690b87276bbb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d55901522f96082a43b9842d34867363c0cdbac5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e091bb55af9a930801f83df78195a908a76e1479"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54170.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54170"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54170.json"}}