CVE-2023-52434

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> smb: client: fix potential OOBs in smb2_parse_contexts()<br /> <br /> Validate offsets and lengths before dereferencing create contexts in<br /> smb2_parse_contexts().<br /> <br /> This fixes following oops when accessing invalid create contexts from<br /> server:<br /> <br /> BUG: unable to handle page fault for address: ffff8881178d8cc3<br /> #PF: supervisor read access in kernel mode<br /> #PF: error_code(0x0000) - not-present page<br /> PGD 4a01067 P4D 4a01067 PUD 0<br /> Oops: 0000 [#1] PREEMPT SMP NOPTI<br /> CPU: 3 PID: 1736 Comm: mount.cifs Not tainted 6.7.0-rc4 #1<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS<br /> rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014<br /> RIP: 0010:smb2_parse_contexts+0xa0/0x3a0 [cifs]<br /> Code: f8 10 75 13 48 b8 93 ad 25 50 9c b4 11 e7 49 39 06 0f 84 d2 00<br /> 00 00 8b 45 00 85 c0 74 61 41 29 c5 48 01 c5 41 83 fd 0f 76 55 b7<br /> 7d 04 0f b7 45 06 4c 8d 74 3d 00 66 83 f8 04 75 bc ba 04 00<br /> RSP: 0018:ffffc900007939e0 EFLAGS: 00010216<br /> RAX: ffffc90000793c78 RBX: ffff8880180cc000 RCX: ffffc90000793c90<br /> RDX: ffffc90000793cc0 RSI: ffff8880178d8cc0 RDI: ffff8880180cc000<br /> RBP: ffff8881178d8cbf R08: ffffc90000793c22 R09: 0000000000000000<br /> R10: ffff8880180cc000 R11: 0000000000000024 R12: 0000000000000000<br /> R13: 0000000000000020 R14: 0000000000000000 R15: ffffc90000793c22<br /> FS: 00007f873753cbc0(0000) GS:ffff88806bc00000(0000)<br /> knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: ffff8881178d8cc3 CR3: 00000000181ca000 CR4: 0000000000750ef0<br /> PKRU: 55555554<br /> Call Trace:<br /> <br /> ? __die+0x23/0x70<br /> ? page_fault_oops+0x181/0x480<br /> ? search_module_extables+0x19/0x60<br /> ? srso_alias_return_thunk+0x5/0xfbef5<br /> ? exc_page_fault+0x1b6/0x1c0<br /> ? asm_exc_page_fault+0x26/0x30<br /> ? smb2_parse_contexts+0xa0/0x3a0 [cifs]<br /> SMB2_open+0x38d/0x5f0 [cifs]<br /> ? smb2_is_path_accessible+0x138/0x260 [cifs]<br /> smb2_is_path_accessible+0x138/0x260 [cifs]<br /> cifs_is_path_remote+0x8d/0x230 [cifs]<br /> cifs_mount+0x7e/0x350 [cifs]<br /> cifs_smb3_do_mount+0x128/0x780 [cifs]<br /> smb3_get_tree+0xd9/0x290 [cifs]<br /> vfs_get_tree+0x2c/0x100<br /> ? capable+0x37/0x70<br /> path_mount+0x2d7/0xb80<br /> ? srso_alias_return_thunk+0x5/0xfbef5<br /> ? _raw_spin_unlock_irqrestore+0x44/0x60<br /> __x64_sys_mount+0x11a/0x150<br /> do_syscall_64+0x47/0xf0<br /> entry_SYSCALL_64_after_hwframe+0x6f/0x77<br /> RIP: 0033:0x7f8737657b1e