What’s Vulnerable › Vulnerabilities

CVE-2023-53006: cifs: Fix oops due to uncleared server->smbd_conn in reconnect

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-27 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix oops due to uncleared server->smbd_conn in reconnect In smbd_destroy(), clear the server->smbd_conn pointer after freeing the smbd_connection struct that it points to so that reconnection doesn't get confused.

Affected products

• Linux kernel: from 4.16 before 4.19.272; from 4.20 before 5.4.231; from 5.5 before 5.10.166; from 5.11 before 5.15.91; from 5.16 before 6.1.9; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4, 6.2-rc5 — fixed in 4.19.272, 5.10.166, 5.15.91, 5.4.231, 6.1.9

How to fix

Upgrade to a fixed version: Linux kernel 4.19.272, 5.10.166, 5.15.91, 5.4.231. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4b83bc6f87eedab4599b0123e572a422689444be
• https://git.kernel.org/stable/c/5109607a4ece7cd8536172bf7549eb4dce1f3576
• https://git.kernel.org/stable/c/91be54849d5392050f5b847b42bd5e6221551ac8
• https://git.kernel.org/stable/c/a9640c0b268405f2540e8203a545e930ea88bb7d
• https://git.kernel.org/stable/c/b7ab9161cf5ddc42a288edf9d1a61f3bdffe17c7
• https://git.kernel.org/stable/c/e037baee16e0b9ace7e730888fcae9cec11daff2

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