CVE-2025-40090— ksmbd: fix recursive locking in RPC handle list access
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I. Basic Information for CVE-2025-40090
Vulnerability Information
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Vulnerability Title
ksmbd: fix recursive locking in RPC handle list access
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix recursive locking in RPC handle list access Since commit 305853cce3794 ("ksmbd: Fix race condition in RPC handle list access"), ksmbd_session_rpc_method() attempts to lock sess->rpc_lock. This causes hung connections / tasks when a client attempts to open a named pipe. Using Samba's rpcclient tool: $ rpcclient //192.168.1.254 -U user%password $ rpcclient $> srvinfo <connection hung here> Kernel side: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:0 pid:5021 tgid:5021 ppid:2 flags:0x00200000 Workqueue: ksmbd-io handle_ksmbd_work Call trace: __schedule from schedule+0x3c/0x58 schedule from schedule_preempt_disabled+0xc/0x10 schedule_preempt_disabled from rwsem_down_read_slowpath+0x1b0/0x1d8 rwsem_down_read_slowpath from down_read+0x28/0x30 down_read from ksmbd_session_rpc_method+0x18/0x3c ksmbd_session_rpc_method from ksmbd_rpc_open+0x34/0x68 ksmbd_rpc_open from ksmbd_session_rpc_open+0x194/0x228 ksmbd_session_rpc_open from create_smb2_pipe+0x8c/0x2c8 create_smb2_pipe from smb2_open+0x10c/0x27ac smb2_open from handle_ksmbd_work+0x238/0x3dc handle_ksmbd_work from process_scheduled_works+0x160/0x25c process_scheduled_works from worker_thread+0x16c/0x1e8 worker_thread from kthread+0xa8/0xb8 kthread from ret_from_fork+0x14/0x38 Exception stack(0x8529ffb0 to 0x8529fff8) The task deadlocks because the lock is already held: ksmbd_session_rpc_open down_write(&sess->rpc_lock) ksmbd_rpc_open ksmbd_session_rpc_method down_read(&sess->rpc_lock) <-- deadlock Adjust ksmbd_session_rpc_method() callers to take the lock when necessary.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于RPC句柄列表访问时出现递归锁定，可能导致连接挂起。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-40090
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Same Patch Batch · Linux · 2025-10-30 · 20 CVEs total
| CVE-2025-40096 | drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies | |
| CVE-2025-40105 | vfs: Don't leak disconnected dentries on umount | |
| CVE-2025-40104 | ixgbevf: fix mailbox API compatibility by negotiating supported features | |
| CVE-2025-40103 | smb: client: Fix refcount leak for cifs_sb_tlink | |
| CVE-2025-40102 | KVM: arm64: Prevent access to vCPU events before init | |
| CVE-2025-40100 | btrfs: do not assert we found block group item when creating free space tree | |
| CVE-2025-40101 | btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST | |
| CVE-2025-40099 | cifs: parse_dfs_referrals: prevent oob on malformed input | |
| CVE-2025-40098 | ALSA: hda: cs35l41: Fix NULL pointer dereference in cs35l41_get_acpi_mute_state() | |
| CVE-2025-40097 | ALSA: hda: Fix missing pointer check in hda_component_manager_init function | |
| CVE-2025-40086 | drm/xe: Don't allow evicting of BOs in same VM in array of VM binds | |
| CVE-2025-40095 | usb: gadget: f_rndis: Refactor bind path to use __free() | |
| CVE-2025-40094 | usb: gadget: f_acm: Refactor bind path to use __free() | |
| CVE-2025-40093 | usb: gadget: f_ecm: Refactor bind path to use __free() | |
| CVE-2025-40092 | usb: gadget: f_ncm: Refactor bind path to use __free() | |
| CVE-2025-40091 | ixgbe: fix too early devlink_free() in ixgbe_remove() | |
| CVE-2025-40089 | cxl/features: Add check for no entries in cxl_feature_info | |
| CVE-2025-40088 | hfsplus: fix slab-out-of-bounds read in hfsplus_strcasecmp() | |
| CVE-2025-40087 | NFSD: Define a proc_layoutcommit for the FlexFiles layout type |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-40090
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