What’s Vulnerable › Vulnerabilities

CVE-2025-37924: ksmbd: fix use-after-free in kerberos authentication

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 24.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-20 · updated 2026-10-15
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.15 before 6.1.138; from 6.2 before 6.6.90; from 6.7 before 6.12.28; from 6.13 before 6.14.6; 6.15-rc1, 6.15-rc2, 6.15-rc3, 6.15-rc4 — fixed in 6.1.138, 6.12.28, 6.14.6, 6.6.90

How to fix

Upgrade to a fixed version: Linux kernel 6.1.138, 6.12.28, 6.14.6, 6.6.90. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890
• https://git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90
• https://git.kernel.org/stable/c/e18c616718018dfc440e4a2d2b94e28fe91b1861
• https://git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2
• https://git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124
• https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html

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