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CVE-2025-68817: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

• Severity: high (CVSS 7.8 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: 2026-01-13 · updated 2026-07-30
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

Affected products

• Linux kernel: from 5.15.145 before 5.15.199; from 6.1.71 before 6.1.160; from 6.6.1 before 6.6.120; from 6.7 before 6.12.64; from 6.13 before 6.18.3; 6.6, 6.6-rc5, 6.6-rc6, 6.6-rc7 — fixed in 5.15.199, 6.1.160, 6.12.64, 6.18.3, 6.6.120

How to fix

Upgrade to a fixed version: Linux kernel 5.15.199, 6.1.160, 6.12.64, 6.18.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21
• https://git.kernel.org/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea
• https://git.kernel.org/stable/c/446beed646b2e426dd53d27358365f8678e1dd01
• https://git.kernel.org/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926
• https://git.kernel.org/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a
• https://git.kernel.org/stable/c/d64977495e44855f2b28d8ce56107c963a7a50e4

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