CVE-2025-21994

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.

Score

CVSS 3.1 7.6 High

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2025-04-02

Last modified

2026-08-05

Affected products

• Linux Kernel (Linux)

References

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