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CVE-2025-40103— smb: client: Fix refcount leak for cifs_sb_tlink

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cifs_sb_tlink函数存在引用计数泄漏问题，可能导致资源泄漏。

AI Predicted 5.0 Difficulty: Theoretical EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 8ceb984379462f94bdebef3288d569c6e1f912ea< d3c8ea197055c260119a13360e8202a27e53e1e4 affected
8ceb984379462f94bdebef3288d569c6e1f912ea< 790282abe9d805f08618c1c24ea2529e7259b692 affected
8ceb984379462f94bdebef3288d569c6e1f912ea< d7dd034c14928306db1b46be277ae439b84dacf9 affected
8ceb984379462f94bdebef3288d569c6e1f912ea< e15605b68b490186da2ad8029c0351a9cfb0b9af affected
8ceb984379462f94bdebef3288d569c6e1f912ea< 896bb31e1416f582503db1350cf1bd10dc64e5a6 affected
8ceb984379462f94bdebef3288d569c6e1f912ea< c2b77f42205ef485a647f62082c442c1cd69d3fc affected
3.7 affected
< 3.7 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-40103

Vulnerability Information
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Vulnerability Title
smb: client: Fix refcount leak for cifs_sb_tlink
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix refcount leak for cifs_sb_tlink Fix three refcount inconsistency issues related to `cifs_sb_tlink`. Comments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be called after successful calls to `cifs_sb_tlink()`. Three calls fail to update refcount accordingly, leading to possible resource leaks.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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cifs_sb_tlink函数存在引用计数泄漏问题，可能导致资源泄漏。
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 8ceb984379462f94bdebef3288d569c6e1f912ea ~ d3c8ea197055c260119a13360e8202a27e53e1e4 -
Linux Linux 3.7 -

II. Public POCs for CVE-2025-40103

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III. Intelligence Information for CVE-2025-40103

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Same Patch Batch · Linux · 2025-10-30 · 20 CVEs total

CVE-2025-40099 9.4 CRITICAL cifs: parse_dfs_referrals: prevent oob on malformed input
CVE-2025-40095 7.8 HIGH usb: gadget: f_rndis: Refactor bind path to use __free()
CVE-2025-40105 7.8 HIGH vfs: Don't leak disconnected dentries on umount
CVE-2025-40104 7.8 HIGH ixgbevf: fix mailbox API compatibility by negotiating supported features
CVE-2025-40096 7.8 HIGH drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies
CVE-2025-40094 7.8 HIGH usb: gadget: f_acm: Refactor bind path to use __free()
CVE-2025-40093 7.8 HIGH usb: gadget: f_ecm: Refactor bind path to use __free()
CVE-2025-40092 7.8 HIGH usb: gadget: f_ncm: Refactor bind path to use __free()
CVE-2025-40090 7.5 HIGH ksmbd: fix recursive locking in RPC handle list access
CVE-2025-40087 7.5 HIGH NFSD: Define a proc_layoutcommit for the FlexFiles layout type
CVE-2025-40088 7.1 HIGH hfsplus: fix slab-out-of-bounds read in hfsplus_strcasecmp()
CVE-2025-40086 drm/xe: Don't allow evicting of BOs in same VM in array of VM binds
CVE-2025-40091 ixgbe: fix too early devlink_free() in ixgbe_remove()
CVE-2025-40097 ALSA: hda: Fix missing pointer check in hda_component_manager_init function
CVE-2025-40098 ALSA: hda: cs35l41: Fix NULL pointer dereference in cs35l41_get_acpi_mute_state()
CVE-2025-40089 cxl/features: Add check for no entries in cxl_feature_info
CVE-2025-40101 btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST
CVE-2025-40100 btrfs: do not assert we found block group item when creating free space tree
CVE-2025-40102 KVM: arm64: Prevent access to vCPU events before init

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40103

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