Vulnerability details
CVE-2025-21994
Linux Linux
ksmbd: fix incorrect validation for num_aces field of smb_acl
CVSS 3.1
7.6High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.6High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 5.15 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf ≤ v < 9c4e202abff45f8eac17989e549fc7a75095f675 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf ≤ v < d0f87370622a853b57e851f7d5a5452b72300f19 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf ≤ v < c3a3484d9d31b27a3db0fab91fcf191132d65236 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf ≤ v < f6a6721802ac2f12f4c1bbe839a4c229b61866f2 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf ≤ v < 1b8b67f3c5e5169535e26efedd3e422172e2db64 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf ≤ v < a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd | CVEProject cvelistV5 (CNA) |
References and advisories
7- 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
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
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Details
- Published
- 2025-04-02
- Last updated
- 2026-08-05
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.3%
Probability of exploitation in 30 days
23.8%
Percentile (among all CVEs)
Weaknesses (CWE)
- —