Answer in brief
CVE-2023-52440 records a Critical severity (CVSS 9.8) vulnerability in ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob(). 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.
CVSS is 9.8. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <bd554ed4fdc3d38404a1c43d428432577573e809 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <30fd6521b2fbd9b767e438e31945e5ea3e3a2fba || >=0626e6641f6b467447c81dd7678a69c66f7746cf <7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <ecd7e1c562cb08e41957fcd4b0e404de5ab38e20 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <4b081ce0d830b684fdf967abc3696d1261387254 | bd554ed4fdc3d38404a1c43d428432577573e809, 30fd6521b2fbd9b767e438e31945e5ea3e3a2fba, 7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4, ecd7e1c562cb08e41957fcd4b0e404de5ab38e20, 4b081ce0d830b684fdf967abc3696d1261387254 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Feb 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2023-52440 records a Critical severity (CVSS 9.8) vulnerability in ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob(). 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.
CVSS is 9.8. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <bd554ed4fdc3d38404a1c43d428432577573e809 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <30fd6521b2fbd9b767e438e31945e5ea3e3a2fba || >=0626e6641f6b467447c81dd7678a69c66f7746cf <7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <ecd7e1c562cb08e41957fcd4b0e404de5ab38e20 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <4b081ce0d830b684fdf967abc3696d1261387254 | bd554ed4fdc3d38404a1c43d428432577573e809, 30fd6521b2fbd9b767e438e31945e5ea3e3a2fba, 7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4, ecd7e1c562cb08e41957fcd4b0e404de5ab38e20, 4b081ce0d830b684fdf967abc3696d1261387254 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Feb 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.
Quoted source text, attributed separately from HOL analysis.