{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-53178", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-53178" ], "published": "2024-12-27T13:53:01Z", "summary": "smb: Don't leak cfid when reconnect races with open_cached_dir", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: Don't leak cfid when reconnect races with open_cached_dir\n\nopen_cached_dir() may either race with the tcon reconnection even before\ncompound_send_recv() or directly trigger a reconnection via\nSMB2_open_init() or SMB_query_info_init().\n\nThe reconnection process invokes invalidate_all_cached_dirs() via\ncifs_mark_open_files_invalid(), which removes all cfids from the\ncfids->entries list but doesn't drop a ref if has_lease isn't true. This\nresults in the currently-being-constructed cfid not being on the list,\nbut still having a refcount of 2. It leaks if returned from\nopen_cached_dir().\n\nFix this by setting cfid->has_lease when the ref is actually taken; the\ncfid will not be used by other threads until it has a valid time.\n\nAddresses these kmemleaks:\n\nunreferenced object 0xffff8881090c4000 (size 1024):\n comm \"bash\", pid 1860, jiffies 4295126592\n hex dump (first 32 bytes):\n 00 01 00 00 00 00 ad de 22 01 00 00 00 00 ad de ........\".......\n 00 ca 45 22 81 88 ff ff f8 dc 4f 04 81 88 ff ff ..E\"......O.....\n backtrace (crc 6f58c20f):\n [] __kmalloc_cache_noprof+0x2be/0x350\n [] open_cached_dir+0x993/0x1fb0\n [] cifs_readdir+0x15a0/0x1d50\n [] iterate_dir+0x28f/0x4b0\n [] __x64_sys_getdents64+0xfd/0x200\n [] do_syscall_64+0x95/0x1a0\n [] entry_SYSCALL_64_after_hwframe+0x76/0x7e\nunreferenced object 0xffff8881044fdcf8 (size 8):\n comm \"bash\", pid 1860, jiffies 4295126592\n hex dump (first 8 bytes):\n 00 cc cc cc cc cc cc cc ........\n backtrace (crc 10c106a9):\n [] __kmalloc_node_track_caller_noprof+0x363/0x480\n [] kstrdup+0x36/0x60\n [] open_cached_dir+0x9b0/0x1fb0\n [] cifs_readdir+0x15a0/0x1d50\n [] iterate_dir+0x28f/0x4b0\n [] __x64_sys_getdents64+0xfd/0x200\n [] do_syscall_64+0x95/0x1a0\n [] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nAnd addresses these BUG splats when unmounting the SMB filesystem:\n\nBUG: Dentry ffff888140590ba0{i=1000000000080,n=/} still in use (2) [unmount of cifs cifs]\nWARNING: CPU: 3 PID: 3433 at fs/dcache.c:1536 umount_check+0xd0/0x100\nModules linked in:\nCPU: 3 UID: 0 PID: 3433 Comm: bash Not tainted 6.12.0-rc4-g850925a8133c-dirty #49\nHardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020\nRIP: 0010:umount_check+0xd0/0x100\nCode: 8d 7c 24 40 e8 31 5a f4 ff 49 8b 54 24 40 41 56 49 89 e9 45 89 e8 48 89 d9 41 57 48 89 de 48 c7 c7 80 e7 db ac e8 f0 72 9a ff <0f> 0b 58 31 c0 5a 5b 5d 41 5c 41 5d 41 5e 41 5f e9 2b e5 5d 01 41\nRSP: 0018:ffff88811cc27978 EFLAGS: 00010286\nRAX: 0000000000000000 RBX: ffff888140590ba0 RCX: ffffffffaaf20bae\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8881f6fb6f40\nRBP: ffff8881462ec000 R08: 0000000000000001 R09: ffffed1023984ee3\nR10: ffff88811cc2771f R11: 00000000016cfcc0 R12: ffff888134383e08\nR13: 0000000000000002 R14: ffff8881462ec668 R15: ffffffffaceab4c0\nFS: 00007f23bfa98740(0000) GS:ffff8881f6f80000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000556de4a6f808 CR3: 0000000123c80000 CR4: 0000000000350ef0\nCall Trace:\n \n d_walk+0x6a/0x530\n shrink_dcache_for_umount+0x6a/0x200\n generic_shutdown_super+0x52/0x2a0\n kill_anon_super+0x22/0x40\n cifs_kill_sb+0x159/0x1e0\n deactivate_locked_super+0x66/0xe0\n cleanup_mnt+0x140/0x210\n task_work_run+0xfb/0x170\n syscall_exit_to_user_mode+0x29f/0x2b0\n do_syscall_64+0xa1/0x1a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7f23bfb93ae7\nCode: ff ff ff ff c3 66 0f 1f 44 00 00 48 8b 0d 11 93 0d 00 f7 d8 64 89 01 b8 ff ff ff ff eb bf 0f 1f 44 00 00 b8 50 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e9 92 0d 00 f7 d8 64 89 \n---truncated---", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3", "1:6.6.62-1+rpt1" ], "ecosystem_specific": { "binaries": [ { 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"cf64a1dfecc2dc418efdd61701c1a4b185ab4761", "upstream_version": "6.6.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.64" }, "1:6.6.51-1+rpt1": { "linux_commit": "0094eba3f2a4338cfa6854b0b5104d02ba0fa01f", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.64" }, "1:6.6.51-1+rpt2": { "linux_commit": "82a50e430ef1d6eb37d78e25aa572c1f6ea56160", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.64" }, "1:6.6.51-1+rpt3": { "linux_commit": "5aeecea9f4a45248bcf564dec924965e066a7bfd", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.64" }, "1:6.6.62-1+rpt1": { "linux_commit": "dd2394360860d15146c96635796a75b05bb32b61", "upstream_version": "6.6.62", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.64" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-53178" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/31fabf70d58388d5475e48ca8a6b7d2847b36678" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1d76332d783db12684b67592f1fb2057b88af4c3" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/73a57b25b4df23f22814fc06b7e8f9cf570be026" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/7afb86733685c64c604d32faf00fa4a1f22c2ab1" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.5, "cvss_v3_severity": "High", "scenario": "AV:N - The SMB client's cached-dir code reacts directly to remote peer behaviour \u2014 a malicious or compromised SMB server, or an on-path attacker able to drop/reset the tcp/445 connection, sets `tcon->need_reconnect` (via `cifs_reconnect()` or a `STATUS_NETWORK_NAME_DELETED` response) and thereby drives `invalidate_all_cached_dirs()` into the window that leaks the cfid.\nAC:L - The attacker controls the reconnect side and can force it repeatedly; moreover `open_cached_dir()` triggers the reconnect synchronously inside `SMB2_open_init()` once `need_reconnect` is set, so the leak is deterministic rather than a race that must be won, and each leak pins another dentry/inode.\nPR:N - No credentials or privileges on the target client are needed \u2014 the attack originates from the server/network side, and the client-side trigger is an ordinary unprivileged `getdents64()`/`stat` on the mount performed by any process or background daemon.\nUI:N - Against an already-mounted share (fstab/autofs/automounted corporate file server) no victim action is required; routine directory access by any existing process supplies the `open_cached_dir()` call while the attacker forces reconnection.\nS:U - The leaked refcount, exhausted memory and resulting BUG are all confined to the kernel of the affected client; no security boundary such as a VM or IOMMU domain is crossed.\nC:N - The defect is an over-reference/leak, not an under-reference or out-of-bounds access; no freed or out-of-bounds memory is read and no kernel data is disclosed to the attacker.\nI:N - Nothing is written out of bounds and no freed object is reused, so the bug provides no mechanism to modify kernel or user data.\nA:H - Each triggered leak permanently loses a `cached_fid`, its path string and a pinned dentry/inode, so repeated triggering exhausts memory, and unmounting the share hits `umount_check` WARN plus `VFS: Busy inodes after unmount` \u2192 `BUG()` at fs/super.c:661 (or `VFS_PTR_POISON`ed inodes that crash on later use) \u2014 a hard kernel crash." } } }