What’s Vulnerable › Vulnerabilities

CVE-2023-53358: ksmbd: fix racy issue under cocurrent smb2 tree disconnect

• 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: 2025-09-17 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix racy issue under cocurrent smb2 tree disconnect There is UAF issue under cocurrent smb2 tree disconnect. This patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent access.

Affected products

• Linux kernel: from 5.15 before 5.15.145; from 5.16 before 6.1.28; from 6.2 before 6.2.15; from 6.3 before 6.3.2 — fixed in 5.15.145, 6.1.28, 6.2.15, 6.3.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.145, 6.1.28, 6.2.15, 6.3.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/30210947a343b6b3ca13adc9bfc88e1543e16dd5
• https://git.kernel.org/stable/c/39366b47a59d46af15ac57beb0996268bf911f6a
• https://git.kernel.org/stable/c/b36295c17fb97424406f0c3ab321b1ccaabb9be8
• https://git.kernel.org/stable/c/bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6
• https://git.kernel.org/stable/c/dc1c17716c099c90948ebb83e2170dd75a3be6b6

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