CVE-2025-21994
ksmbd: fix incorrect validation for num_aces field of smb_acl
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Apr 2, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
0626e6641f6b467447c81dd7678a69c66f7746cf < c3a3484d9d31b27a3db0fab91fcf191132d65236 0626e6641f6b467447c81dd7678a69c66f7746cf < 9c4e202abff45f8eac17989e549fc7a75095f675 0626e6641f6b467447c81dd7678a69c66f7746cf < d0f87370622a853b57e851f7d5a5452b72300f19 0626e6641f6b467447c81dd7678a69c66f7746cf < a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd 0626e6641f6b467447c81dd7678a69c66f7746cf < f6a6721802ac2f12f4c1bbe839a4c229b61866f2 0626e6641f6b467447c81dd7678a69c66f7746cf < 1b8b67f3c5e5169535e26efedd3e422172e2db64
Linux / Linux
5.15
References
git.kernel.org: https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236 git.kernel.org: https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675 git.kernel.org: https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19 git.kernel.org: https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd git.kernel.org: https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2 git.kernel.org: https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64 lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html