- Vulnerability/
- CVE-2025-21994
CVE-2025-21994: ksmbd: fix incorrect validation for num_aces field of smb_acl
First published: Wed Apr 02 2025(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
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Reference Links
- https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675
- https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19
- https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd
- https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2
- https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64
Frequently Asked Questions
What is the severity of CVE-2025-21994?
CVE-2025-21994 is classified as a high-severity vulnerability affecting the Linux kernel.
How do I fix CVE-2025-21994?
To address CVE-2025-21994, update your Linux kernel to the latest available version that contains the fix.
What are the consequences of exploiting CVE-2025-21994?
Exploiting CVE-2025-21994 could lead to unauthorized access or modification of ACLs within the kernel.
Which versions of the Linux kernel are affected by CVE-2025-21994?
CVE-2025-21994 affects various versions of the Linux kernel up to the fixed release.
Is CVE-2025-21994 related to SMB functionality in the Linux kernel?
Yes, CVE-2025-21994 involves a fix related to incorrect validation within the SMB ACL handling of the Linux kernel.
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