CVE-2025-21994

MEDIUM EPSS 6.1%
Published Apr 2, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 2, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
6.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥5.15  –  <5.15.180
linuxlinux_kernel*≥5.16  –  <6.1.132
linuxlinux_kernel*≥6.2  –  <6.6.85
linuxlinux_kernel*≥6.7  –  <6.12.21
linuxlinux_kernel*≥6.13  –  <6.13.9
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2
    Patch