What’s Vulnerable › Vulnerabilities

CVE-2025-22037: ksmbd: fix null pointer dereference in alloc_preauth_hash()

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 69.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-16 · updated 2026-10-30
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in alloc_preauth_hash() The Client send malformed smb2 negotiate request. ksmbd return error response. Subsequently, the client can send smb2 session setup even thought conn->preauth_info is not allocated. This patch add KSMBD_SESS_NEED_SETUP status of connection to ignore session setup request if smb2 negotiate phase is not complete.

Affected products

• Linux kernel: from 6.6 before 6.6.107; from 6.12 before 6.12.23; from 6.13 before 6.13.11; from 6.14 before 6.14.2 — fixed in 6.6.107, 6.12.23, 6.13.11, 6.14.2
• Linux: 5.15 — fixed in 6.15

How to fix

Upgrade to a fixed version: Linux kernel 6.6.107, 6.12.23, 6.13.11, 6.14.2; Linux 6.15. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2d3461d6ae74ebdcd4d65128c855198649bcadcd
• https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d
• https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335
• https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780
• https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad
• https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6
• https://www.zerodayinitiative.com/advisories/ZDI-25-310/

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