CVE-2025-38244— smb: client: fix potential deadlock when reconnecting channels
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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smb客户端重新连接通道时潜在死锁。
Possible ATT&CK Techniques 1 AI
T1211 · Exploitation for StealthAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8< c82c7041258d96e3286f6790ab700e4edd3cc9e3 |
affected |
d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8< 7f3ead8ebc0ef65b6c89a13912b4e80218425629 |
affected | ||
d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8< fe035dc78aa6ca8f862857d45beaf7a0e03206ca |
affected | ||
d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8< 711741f94ac3cf9f4e3aa73aa171e76d188c0819 |
affected | ||
6.0 |
affected | ||
< 6.0 |
unaffected | ||
6.6.96≤ 6.6.* |
unaffected | ||
6.12.36≤ 6.12.* |
unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2025-38244
Vulnerability Information
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Vulnerability Title
smb: client: fix potential deadlock when reconnecting channels
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix potential deadlock when reconnecting channels
Fix cifs_signal_cifsd_for_reconnect() to take the correct lock order
and prevent the following deadlock from happening
======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc3-build2+ #1301 Tainted: G S W
------------------------------------------------------
cifsd/6055 is trying to acquire lock:
ffff88810ad56038 (&tcp_ses->srv_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x134/0x200
but task is already holding lock:
ffff888119c64330 (&ret_buf->chan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&ret_buf->chan_lock){+.+.}-{3:3}:
validate_chain+0x1cf/0x270
__lock_acquire+0x60e/0x780
lock_acquire.part.0+0xb4/0x1f0
_raw_spin_lock+0x2f/0x40
cifs_setup_session+0x81/0x4b0
cifs_get_smb_ses+0x771/0x900
cifs_mount_get_session+0x7e/0x170
cifs_mount+0x92/0x2d0
cifs_smb3_do_mount+0x161/0x460
smb3_get_tree+0x55/0x90
vfs_get_tree+0x46/0x180
do_new_mount+0x1b0/0x2e0
path_mount+0x6ee/0x740
do_mount+0x98/0xe0
__do_sys_mount+0x148/0x180
do_syscall_64+0xa4/0x260
entry_SYSCALL_64_after_hwframe+0x76/0x7e
-> #1 (&ret_buf->ses_lock){+.+.}-{3:3}:
validate_chain+0x1cf/0x270
__lock_acquire+0x60e/0x780
lock_acquire.part.0+0xb4/0x1f0
_raw_spin_lock+0x2f/0x40
cifs_match_super+0x101/0x320
sget+0xab/0x270
cifs_smb3_do_mount+0x1e0/0x460
smb3_get_tree+0x55/0x90
vfs_get_tree+0x46/0x180
do_new_mount+0x1b0/0x2e0
path_mount+0x6ee/0x740
do_mount+0x98/0xe0
__do_sys_mount+0x148/0x180
do_syscall_64+0xa4/0x260
entry_SYSCALL_64_after_hwframe+0x76/0x7e
-> #0 (&tcp_ses->srv_lock){+.+.}-{3:3}:
check_noncircular+0x95/0xc0
check_prev_add+0x115/0x2f0
validate_chain+0x1cf/0x270
__lock_acquire+0x60e/0x780
lock_acquire.part.0+0xb4/0x1f0
_raw_spin_lock+0x2f/0x40
cifs_signal_cifsd_for_reconnect+0x134/0x200
__cifs_reconnect+0x8f/0x500
cifs_handle_standard+0x112/0x280
cifs_demultiplex_thread+0x64d/0xbc0
kthread+0x2f7/0x310
ret_from_fork+0x2a/0x230
ret_from_fork_asm+0x1a/0x30
other info that might help us debug this:
Chain exists of:
&tcp_ses->srv_lock --> &ret_buf->ses_lock --> &ret_buf->chan_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ret_buf->chan_lock);
lock(&ret_buf->ses_lock);
lock(&ret_buf->chan_lock);
lock(&tcp_ses->srv_lock);
*** DEADLOCK ***
3 locks held by cifsd/6055:
#0: ffffffff857de398 (&cifs_tcp_ses_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x7b/0x200
#1: ffff888119c64060 (&ret_buf->ses_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x9c/0x200
#2: ffff888119c64330 (&ret_buf->chan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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smb客户端重新连接通道时潜在死锁。
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-2025-38244
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-07-09 · 26 CVEs total
| CVE-2025-38264 | 9.8 CRITICAL | nvme-tcp: sanitize request list handling |
| CVE-2025-38246 | 9.8 CRITICAL | bnxt: properly flush XDP redirect lists |
| CVE-2025-38238 | 8.8 HIGH | scsi: fnic: Fix crash in fnic_wq_cmpl_handler when FDMI times out |
| CVE-2025-38253 | 8.8 HIGH | HID: wacom: fix crash in wacom_aes_battery_handler() |
| CVE-2025-38242 | 7.8 HIGH | mm: userfaultfd: fix race of userfaultfd_move and swap cache |
| CVE-2025-38261 | 7.8 HIGH | riscv: save the SR_SUM status over switches |
| CVE-2025-38262 | 7.8 HIGH | tty: serial: uartlite: register uart driver in init |
| CVE-2025-38248 | 7.8 HIGH | bridge: mcast: Fix use-after-free during router port configuration |
| CVE-2025-38250 | 7.8 HIGH | Bluetooth: hci_core: Fix use-after-free in vhci_flush() |
| CVE-2025-38252 | 7.8 HIGH | cxl/ras: Fix CPER handler device confusion |
| CVE-2025-38239 | 7.3 HIGH | scsi: megaraid_sas: Fix invalid node index |
| CVE-2025-38257 | 7.3 HIGH | s390/pkey: Prevent overflow in size calculation for memdup_user() |
| CVE-2025-38251 | atm: clip: prevent NULL deref in clip_push() | |
| CVE-2025-38249 | ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() | |
| CVE-2025-38254 | drm/amd/display: Add sanity checks for drm_edid_raw() | |
| CVE-2025-38255 | lib/group_cpus: fix NULL pointer dereference from group_cpus_evenly() | |
| CVE-2025-38256 | io_uring/rsrc: fix folio unpinning | |
| CVE-2025-38247 | userns and mnt_idmap leak in open_tree_attr(2) | |
| CVE-2025-38258 | mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write | |
| CVE-2025-38259 | ASoC: codecs: wcd9335: Fix missing free of regulator supplies |
Showing top 20 of 26 CVEs. View all on vendor page → →
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V. Comments for CVE-2025-38244
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