CVE-2025-21994

ksmbd: fix incorrect validation for num_aces field of smb_acl

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.

N/A

CVSS

Severity:

EPSS 0.06%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236
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 has not yet been assigned a CVSS score.
How to fix CVE-2025-21994?: To fix CVE-2025-21994, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21994 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21994 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21994?: CVE-2025-21994 affects Linux Linux, Linux Linux.

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