What’s Vulnerable › Vulnerabilities

CVE-2025-40286: smb/server: fix possible memory leak in smb2_read()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-06 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: smb/server: fix possible memory leak in smb2_read() Memory leak occurs when ksmbd_vfs_read() fails. Fix this by adding the missing kvfree().

Affected products

• Linux kernel: 5.15 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0797c6cf3b857cc229ab2bc69552938dcd738d78
• https://git.kernel.org/stable/c/63d8706a2c09a0c29b8b0e8a44bc7a1339685de9
• https://git.kernel.org/stable/c/6fced056d2cc8d01b326e6fcfabaacb9850b71a4
• https://git.kernel.org/stable/c/bfda5422a16651d0bf864ec468b1c216e1b10d91
• https://git.kernel.org/stable/c/f1305587731886da37a214cda812ade246c653b0

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