What’s Vulnerable › Vulnerabilities

CVE-2025-37776: ksmbd: fix use-after-free in smb_break_all_levII_oplock()

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-01 · updated 2026-07-30
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb_break_all_levII_oplock() There is a room in smb_break_all_levII_oplock that can cause racy issues when unlocking in the middle of the loop. This patch use read lock to protect whole loop.

Affected products

• Linux kernel: from 5.15 before 6.6.88; from 6.7 before 6.12.25; from 6.13 before 6.14.4; 6.15-rc1, 6.15-rc2 — fixed in 6.12.25, 6.14.4, 6.6.88

How to fix

Upgrade to a fixed version: Linux kernel 6.12.25, 6.14.4, 6.6.88. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/18b4fac5ef17f77fed9417d22210ceafd6525fc7
• https://git.kernel.org/stable/c/296cb5457cc6f4a754c4ae29855f8a253d52bcc6
• https://git.kernel.org/stable/c/d54ab1520d43e95f9b2e22d7a05fc9614192e5a5
• https://git.kernel.org/stable/c/d73686367ad68534257cd88a36ca3c52cb8b81d8

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