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CVE-2025-21994— ksmbd: fix incorrect validation for num_aces field of smb_acl

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ksmbd模块对smb_acl的num_aces字段验证不正确，可能导致内存分配问题。

CVSS 7.6 · High EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf< c3a3484d9d31b27a3db0fab91fcf191132d65236 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 9c4e202abff45f8eac17989e549fc7a75095f675 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< d0f87370622a853b57e851f7d5a5452b72300f19 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd affected
0626e6641f6b467447c81dd7678a69c66f7746cf< f6a6721802ac2f12f4c1bbe839a4c229b61866f2 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 1b8b67f3c5e5169535e26efedd3e422172e2db64 affected
5.15 affected
< 5.15 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-21994

Vulnerability Information
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Vulnerability Title
ksmbd: fix incorrect validation for num_aces field of smb_acl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix incorrect validation for num_aces field of smb_acl parse_dcal() validate num_aces to allocate posix_ace_state_array. if (num_aces > ULONG_MAX / sizeof(struct smb_ace *)) It is an incorrect validation that we can create an array of size ULONG_MAX. smb_acl has ->size field to calculate actual number of aces in request buffer size. Use this to check invalid num_aces.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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ksmbd模块对smb_acl的num_aces字段验证不正确，可能导致内存分配问题。
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 ~ c3a3484d9d31b27a3db0fab91fcf191132d65236 -
Linux Linux 5.15 -

II. Public POCs for CVE-2025-21994

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III. Intelligence Information for CVE-2025-21994

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Patches & Fixes for CVE-2025-21994 (4)

Same Patch Batch · Linux · 2025-04-02 · 8 CVEs total

CVE-2025-21988 9.8 CRITICAL fs/netfs/read_collect: add to next->prev_donated
CVE-2025-21993 iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
CVE-2025-21992 HID: ignore non-functional sensor in HP 5MP Camera
CVE-2025-21991 x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes
CVE-2025-21990 drm/amdgpu: NULL-check BO's backing store when determining GFX12 PTE flags
CVE-2025-21989 drm/amd/display: fix missing .is_two_pixels_per_container
CVE-2025-21987 drm/amdgpu: init return value in amdgpu_ttm_clear_buffer

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21994

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