Unrated severityNVD Advisory· Published Apr 2, 2025· Updated Nov 3, 2025
ksmbd: fix incorrect validation for num_aces field of smb_acl
CVE-2025-21994
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.
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Affected products
2Patches
Vulnerability mechanics
References
6- git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64mitre
- git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675mitre
- git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fdmitre
- git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236mitre
- git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19mitre
- git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2mitre
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