What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-19 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.15 before 6.1.148; from 6.2 before 6.6.102; from 6.7 before 6.12.42; from 6.13 before 6.15.10; from 6.16 before 6.16.1 — fixed in 6.1.148, 6.12.42, 6.15.10, 6.16.1, 6.6.102

How to fix

Upgrade to a fixed version: Linux kernel 6.1.148, 6.12.42, 6.15.10, 6.16.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/015ef163d65496ae3ba6192c96140a22743f0353
• https://git.kernel.org/stable/c/2a30ed6428ce83afedca1a6c5c5c4247bcf12d0e
• https://git.kernel.org/stable/c/922f85e6e88fdea723a26854c3a6dcb4beb8d0b9
• https://git.kernel.org/stable/c/96a82e19434a2522525baab59c33332658bc7653
• https://git.kernel.org/stable/c/9b493ab6f35178afd8d619800df9071992f715de
• https://git.kernel.org/stable/c/9c2dbbc959e1fcc6f603a1a843e9cf743ba383bb
• https://git.kernel.org/stable/c/d79c8bebaa622ee223128be7c66d8aaeeb634a57
• https://www.zerodayinitiative.com/advisories/ZDI-25-917/
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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