# CVE-2025-38562: ksmbd: fix null pointer dereference error in generate_encryptionkey

CVE-2025-38562 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-38562, released August 19, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-38562
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.1300
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 19, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38562

## Description

In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix null pointer dereference error in generate_encryptionkey  If client send two session setups with krb5 authenticate to ksmbd, null pointer dereference error in generate_encryptionkey could happen. sess->Preauth_HashValue is set to NULL if session is valid. So this patch skip generate encryption key if session is valid.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.148-1 | [DEBIAN-CVE-2025-38562](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38562.md) | Aug 19, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.43-1 | [DEBIAN-CVE-2025-38562](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38562.md) | Aug 19, 2025 |
| Linux | linux Debian 14 | 6.16.3-1 | [DEBIAN-CVE-2025-38562](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38562.md) | Aug 19, 2025 |

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