What’s Vulnerable › Vulnerabilities

CVE-2023-54280: cifs: fix potential race when tree connecting ipc

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential race when tree connecting ipc Protect access of TCP_Server_Info::hostname when building the ipc tree name as it might get freed in cifsd thread and thus causing an use-after-free bug in __tree_connect_dfs_target(). Also, while at it, update status of IPC tcon on success and then avoid any extra tree connects.

Affected products

• Linux kernel: from 5.15.81 before 5.16; 5.16 — fixed in 5.16, 6.4

How to fix

Upgrade to a fixed version: Linux kernel 5.16, 6.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/536ec71ba060a02fabe8e22cecb82fe7b3a8708b
• https://git.kernel.org/stable/c/553476df55a111e6a66ad9155256aec0ec1b7ad0
• https://git.kernel.org/stable/c/ee20d7c6100752eaf2409d783f4f1449c29ea33d

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