CVE-2025-21994
HIGH severity · CVSS 7.6
7.6CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactLow
Integrity impactLow
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64Patch
- https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675Patch
- https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fdPatch
- https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236Patch
- https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19Patch
- https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2Patch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html