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CVE-2025-40084— ksmbd: transport_ipc: validate payload size before reading handle

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，该漏洞源于未验证有效载荷大小，可能导致越界读取。

CVSS 7.1 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf< a02e432d5130da4c723aabe1205bac805889fdb2 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 2dc125f5da134c0915a840b62565c60a595673dd affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 898d527ed94c19980a4d848f10057f1fed578ffb affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 867ffd9d67285612da3f0498ca618297f8e41f01 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0 affected
5.15 affected
< 5.15 unaffected
6.1.158≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-40084

Vulnerability Information
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Vulnerability Title
ksmbd: transport_ipc: validate payload size before reading handle
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: transport_ipc: validate payload size before reading handle handle_response() dereferences the payload as a 4-byte handle without verifying that the declared payload size is at least 4 bytes. A malformed or truncated message from ksmbd.mountd can lead to a 4-byte read past the declared payload size. Validate the size before dereferencing. This is a minimal fix to guard the initial handle read.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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，该漏洞源于未验证有效载荷大小，可能导致越界读取。
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 0626e6641f6b467447c81dd7678a69c66f7746cf ~ a02e432d5130da4c723aabe1205bac805889fdb2 -
Linux Linux 5.15 -

II. Public POCs for CVE-2025-40084

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III. Intelligence Information for CVE-2025-40084

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Patches & Fixes for CVE-2025-40084 (4)

Same Patch Batch · Linux · 2025-10-29 · 4 CVEs total

CVE-2023-7324 8.1 HIGH scsi: ses: Fix possible addl_desc_ptr out-of-bounds accesses
CVE-2025-40085 ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card
CVE-2025-40083 net/sched: sch_qfq: Fix null-deref in agg_dequeue

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40084

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