{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2023-52751", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free in smb2_query_info_compound()\n\nThe following UAF was triggered when running fstests generic/072 with\nKASAN enabled against Windows Server 2022 and mount options\n'multichannel,max_channels=2,vers=3.1.1,mfsymlinks,noperm'\n\n BUG: KASAN: slab-use-after-free in smb2_query_info_compound+0x423/0x6d0 [cifs]\n Read of size 8 at addr ffff888014941048 by task xfs_io/27534\n\n CPU: 0 PID: 27534 Comm: xfs_io Not tainted 6.6.0-rc7 #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 Call Trace:\n dump_stack_lvl+0x4a/0x80\n print_report+0xcf/0x650\n ? srso_alias_return_thunk+0x5/0x7f\n ? srso_alias_return_thunk+0x5/0x7f\n ? __phys_addr+0x46/0x90\n kasan_report+0xda/0x110\n ? smb2_query_info_compound+0x423/0x6d0 [cifs]\n ? smb2_query_info_compound+0x423/0x6d0 [cifs]\n smb2_query_info_compound+0x423/0x6d0 [cifs]\n ? __pfx_smb2_query_info_compound+0x10/0x10 [cifs]\n ? srso_alias_return_thunk+0x5/0x7f\n ? __stack_depot_save+0x39/0x480\n ? kasan_save_stack+0x33/0x60\n ? kasan_set_track+0x25/0x30\n ? ____kasan_slab_free+0x126/0x170\n smb2_queryfs+0xc2/0x2c0 [cifs]\n ? __pfx_smb2_queryfs+0x10/0x10 [cifs]\n ? __pfx___lock_acquire+0x10/0x10\n smb311_queryfs+0x210/0x220 [cifs]\n ? __pfx_smb311_queryfs+0x10/0x10 [cifs]\n ? srso_alias_return_thunk+0x5/0x7f\n ? __lock_acquire+0x480/0x26c0\n ? lock_release+0x1ed/0x640\n ? srso_alias_return_thunk+0x5/0x7f\n ? do_raw_spin_unlock+0x9b/0x100\n cifs_statfs+0x18c/0x4b0 [cifs]\n statfs_by_dentry+0x9b/0xf0\n fd_statfs+0x4e/0xb0\n __do_sys_fstatfs+0x7f/0xe0\n ? __pfx___do_sys_fstatfs+0x10/0x10\n ? srso_alias_return_thunk+0x5/0x7f\n ? lockdep_hardirqs_on_prepare+0x136/0x200\n ? srso_alias_return_thunk+0x5/0x7f\n do_syscall_64+0x3f/0x90\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\n Allocated by task 27534:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n __kasan_kmalloc+0x8f/0xa0\n open_cached_dir+0x71b/0x1240 [cifs]\n smb2_query_info_compound+0x5c3/0x6d0 [cifs]\n smb2_queryfs+0xc2/0x2c0 [cifs]\n smb311_queryfs+0x210/0x220 [cifs]\n cifs_statfs+0x18c/0x4b0 [cifs]\n statfs_by_dentry+0x9b/0xf0\n fd_statfs+0x4e/0xb0\n __do_sys_fstatfs+0x7f/0xe0\n do_syscall_64+0x3f/0x90\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\n Freed by task 27534:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n kasan_save_free_info+0x2b/0x50\n ____kasan_slab_free+0x126/0x170\n slab_free_freelist_hook+0xd0/0x1e0\n __kmem_cache_free+0x9d/0x1b0\n open_cached_dir+0xff5/0x1240 [cifs]\n smb2_query_info_compound+0x5c3/0x6d0 [cifs]\n smb2_queryfs+0xc2/0x2c0 [cifs]\n\nThis is a race between open_cached_dir() and cached_dir_lease_break()\nwhere the cache entry for the open directory handle receives a lease\nbreak while creating it. And before returning from open_cached_dir(),\nwe put the last reference of the new @cfid because of\n!@cfid->has_lease.\n\nBesides the UAF, while running xfstests a lot of missed lease breaks\nhave been noticed in tests that run several concurrent statfs(2) calls\non those cached fids\n\n CIFS: VFS: \\\\w22-root1.gandalf.test No task to wake, unknown frame...\n CIFS: VFS: \\\\w22-root1.gandalf.test Cmd: 18 Err: 0x0 Flags: 0x1...\n CIFS: VFS: \\\\w22-root1.gandalf.test smb buf 00000000715bfe83 len 108\n CIFS: VFS: Dump pending requests:\n CIFS: VFS: \\\\w22-root1.gandalf.test No task to wake, unknown frame...\n CIFS: VFS: \\\\w22-root1.gandalf.test Cmd: 18 Err: 0x0 Flags: 0x1...\n CIFS: VFS: \\\\w22-root1.gandalf.test smb buf 000000005aa7316e len 108\n ...\n\nTo fix both, in open_cached_dir() ensure that @cfid->has_lease is set\nright before sending out compounded request so that any potential\nlease break will be get processed by demultiplex thread while we're\nstill caching @cfid. And, if open failed for some reason, re-check\n@cfid->has_lease to decide whether or not put lease reference." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "1da177e4c3f4", "version_value": "6db94d08359c" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "6.5.13", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.3", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.7", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/6db94d08359c43f2c8fe372811cdee04564a41b9", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/6db94d08359c43f2c8fe372811cdee04564a41b9" }, { "url": "https://git.kernel.org/stable/c/93877b9afc2994c89362007aac480a7b150f386f", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/93877b9afc2994c89362007aac480a7b150f386f" }, { "url": "https://git.kernel.org/stable/c/5c86919455c1edec99ebd3338ad213b59271a71b", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/5c86919455c1edec99ebd3338ad213b59271a71b" } ] }, "generator": { "engine": "bippy-a5840b7849dd" } }