{"id":"CVE-2023-52434","summary":"smb: client: fix potential OOBs in smb2_parse_contexts()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential OOBs in smb2_parse_contexts()\n\nValidate offsets and lengths before dereferencing create contexts in\nsmb2_parse_contexts().\n\nThis fixes following oops when accessing invalid create contexts from\nserver:\n\n  BUG: unable to handle page fault for address: ffff8881178d8cc3\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 4a01067 P4D 4a01067 PUD 0\n  Oops: 0000 [#1] PREEMPT SMP NOPTI\n  CPU: 3 PID: 1736 Comm: mount.cifs Not tainted 6.7.0-rc4 #1\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n  rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014\n  RIP: 0010:smb2_parse_contexts+0xa0/0x3a0 [cifs]\n  Code: f8 10 75 13 48 b8 93 ad 25 50 9c b4 11 e7 49 39 06 0f 84 d2 00\n  00 00 8b 45 00 85 c0 74 61 41 29 c5 48 01 c5 41 83 fd 0f 76 55 \u003c0f\u003e b7\n  7d 04 0f b7 45 06 4c 8d 74 3d 00 66 83 f8 04 75 bc ba 04 00\n  RSP: 0018:ffffc900007939e0 EFLAGS: 00010216\n  RAX: ffffc90000793c78 RBX: ffff8880180cc000 RCX: ffffc90000793c90\n  RDX: ffffc90000793cc0 RSI: ffff8880178d8cc0 RDI: ffff8880180cc000\n  RBP: ffff8881178d8cbf R08: ffffc90000793c22 R09: 0000000000000000\n  R10: ffff8880180cc000 R11: 0000000000000024 R12: 0000000000000000\n  R13: 0000000000000020 R14: 0000000000000000 R15: ffffc90000793c22\n  FS: 00007f873753cbc0(0000) GS:ffff88806bc00000(0000)\n  knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: ffff8881178d8cc3 CR3: 00000000181ca000 CR4: 0000000000750ef0\n  PKRU: 55555554\n  Call Trace:\n   \u003cTASK\u003e\n   ? __die+0x23/0x70\n   ? page_fault_oops+0x181/0x480\n   ? search_module_extables+0x19/0x60\n   ? srso_alias_return_thunk+0x5/0xfbef5\n   ? exc_page_fault+0x1b6/0x1c0\n   ? asm_exc_page_fault+0x26/0x30\n   ? smb2_parse_contexts+0xa0/0x3a0 [cifs]\n   SMB2_open+0x38d/0x5f0 [cifs]\n   ? smb2_is_path_accessible+0x138/0x260 [cifs]\n   smb2_is_path_accessible+0x138/0x260 [cifs]\n   cifs_is_path_remote+0x8d/0x230 [cifs]\n   cifs_mount+0x7e/0x350 [cifs]\n   cifs_smb3_do_mount+0x128/0x780 [cifs]\n   smb3_get_tree+0xd9/0x290 [cifs]\n   vfs_get_tree+0x2c/0x100\n   ? capable+0x37/0x70\n   path_mount+0x2d7/0xb80\n   ? srso_alias_return_thunk+0x5/0xfbef5\n   ? _raw_spin_unlock_irqrestore+0x44/0x60\n   __x64_sys_mount+0x11a/0x150\n   do_syscall_64+0x47/0xf0\n   entry_SYSCALL_64_after_hwframe+0x6f/0x77\n  RIP: 0033:0x7f8737657b1e","modified":"2026-04-02T09:42:45.665349Z","published":"2024-02-20T18:04:44.006Z","related":["ALSA-2024:2394","SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2025:0236-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52434.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13fb0fc4917621f3dfa285a27eaf7151d770b5e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/17a0f64cc02d4972e21c733d9f21d1c512963afa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1ae3c59355dc9882e09c020afe8ffbd895ad0f29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6726429c18c62dbf5e96ebbd522f262e016553fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/890bc4fac3c0973a49cac35f634579bebba7fe48"},{"type":"WEB","url":"https://git.kernel.org/stable/c/af1689a9b7701d9907dfc84d2a4b57c4bc907144"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52434.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52434"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20250117-0009/"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b8c32dbb0deb287a5fcb78251e4eae6c7275760d"},{"fixed":"6726429c18c62dbf5e96ebbd522f262e016553fb"},{"fixed":"13fb0fc4917621f3dfa285a27eaf7151d770b5e5"},{"fixed":"890bc4fac3c0973a49cac35f634579bebba7fe48"},{"fixed":"1ae3c59355dc9882e09c020afe8ffbd895ad0f29"},{"fixed":"17a0f64cc02d4972e21c733d9f21d1c512963afa"},{"fixed":"af1689a9b7701d9907dfc84d2a4b57c4bc907144"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52434.json"}}],"schema_version":"1.7.5"}