Answer in brief
CVE-2025-21994 records a Unknown severity vulnerability in ksmbd: fix incorrect validation for num_aces field of smb_acl. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-21994 records a Unknown severity vulnerability in ksmbd: fix incorrect validation for num_aces field of smb_acl. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <c3a3484d9d31b27a3db0fab91fcf191132d65236 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <9c4e202abff45f8eac17989e549fc7a75095f675 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <d0f87370622a853b57e851f7d5a5452b72300f19 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd || >=0626e6641f6b467447c81dd7678a69c66f7746cf <f6a6721802ac2f12f4c1bbe839a4c229b61866f2 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <1b8b67f3c5e5169535e26efedd3e422172e2db64 | c3a3484d9d31b27a3db0fab91fcf191132d65236, 9c4e202abff45f8eac17989e549fc7a75095f675, d0f87370622a853b57e851f7d5a5452b72300f19, a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd, f6a6721802ac2f12f4c1bbe839a4c229b61866f2, 1b8b67f3c5e5169535e26efedd3e422172e2db64 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Apr 2, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <c3a3484d9d31b27a3db0fab91fcf191132d65236 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <9c4e202abff45f8eac17989e549fc7a75095f675 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <d0f87370622a853b57e851f7d5a5452b72300f19 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd || >=0626e6641f6b467447c81dd7678a69c66f7746cf <f6a6721802ac2f12f4c1bbe839a4c229b61866f2 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <1b8b67f3c5e5169535e26efedd3e422172e2db64 | c3a3484d9d31b27a3db0fab91fcf191132d65236, 9c4e202abff45f8eac17989e549fc7a75095f675, d0f87370622a853b57e851f7d5a5452b72300f19, a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd, f6a6721802ac2f12f4c1bbe839a4c229b61866f2, 1b8b67f3c5e5169535e26efedd3e422172e2db64 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Apr 2, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.