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CVE-2025-40285— smb/server: fix possible refcount leak in smb2_sess_setup()

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 server未正确释放ksmbd_session引用，可能导致内存泄漏。

CVSS 7.5 · High EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux 37a0e2b362b3150317fb6e2139de67b1e29ae5ff< 6fc935f798d44a8eb8a5e6659198399fbf57b981 affected
450a844c045ff0895d41b05a1cbe8febd1acfcfd< e671f9bb97805771380c98de944e2ceab6949188 affected
a39e31e22a535d47b14656a7d6a893c7f6cf758c< dcc51dfe6ff26b52cac106865a172ac982d78401 affected
b95629435b84b9ecc0c765995204a4d8a913ed52< d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d affected
b95629435b84b9ecc0c765995204a4d8a913ed52< 379510a815cb2e64eb0a379cb62295d6ade65df0 affected
2107ab40629aeabbec369cf34b8cf0f288c3eb1b affected
6.1.121< 6.1.159 affected
6.6.67< 6.6.117 affected
… +9 more rows
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I. Basic Information for CVE-2025-40285

Vulnerability Information
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Vulnerability Title
smb/server: fix possible refcount leak in smb2_sess_setup()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb/server: fix possible refcount leak in smb2_sess_setup() Reference count of ksmbd_session will leak when session need reconnect. Fix this by adding the missing ksmbd_user_session_put().
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 server未正确释放ksmbd_session引用，可能导致内存泄漏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 37a0e2b362b3150317fb6e2139de67b1e29ae5ff ~ 6fc935f798d44a8eb8a5e6659198399fbf57b981 -
Linux Linux 6.13 -

II. Public POCs for CVE-2025-40285

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III. Intelligence Information for CVE-2025-40285

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Same Patch Batch · Linux · 2025-12-06 · 23 CVEs total

CVE-2025-40282 8.8 HIGH Bluetooth: 6lowpan: reset link-local header on ipv6 recv path
CVE-2025-40273 8.8 HIGH NFSD: free copynotify stateid in nfs4_free_ol_stateid()
CVE-2025-40269 7.8 HIGH ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
CVE-2025-40284 7.8 HIGH Bluetooth: MGMT: cancel mesh send timer when hdev removed
CVE-2025-40283 7.8 HIGH Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF
CVE-2025-40270 7.8 HIGH mm, swap: fix potential UAF issue for VMA readahead
CVE-2025-40280 7.8 HIGH tipc: Fix use-after-free in tipc_mon_reinit_self().
CVE-2025-40271 7.8 HIGH fs/proc: fix uaf in proc_readdir_de()
CVE-2025-40272 7.8 HIGH mm/secretmem: fix use-after-free race in fault handler
CVE-2025-40277 7.8 HIGH drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE
CVE-2025-40274 7.8 HIGH KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying
CVE-2025-40276 7.3 HIGH drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
CVE-2025-40267 io_uring/rw: ensure allocated iovec gets cleared for early failure
CVE-2025-40289 drm/amdgpu: hide VRAM sysfs attributes on GPUs without VRAM
CVE-2025-40268 cifs: client: fix memory leak in smb3_fs_context_parse_param
CVE-2025-40275 ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd
CVE-2025-40278 net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak
CVE-2025-40279 net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
CVE-2025-40281 sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto
CVE-2025-40286 smb/server: fix possible memory leak in smb2_read()

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40285

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