What’s Vulnerable › Vulnerabilities

CVE-2023-53751: cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname

• Severity: critical (CVSS 9.8 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: 2025-12-08 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname TCP_Server_Info::hostname may be updated once or many times during reconnect, so protect its access outside reconnect path as well and then prevent any potential use-after-free bugs.

Affected products

• Linux kernel: 5.0 — fixed in 6.4

How to fix

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

References

• https://git.kernel.org/stable/c/0b08c4c499200be67d54c439d56e5ea866869945
• https://git.kernel.org/stable/c/64d62ac6d6514cba1305bd08e271ec1843bdd612
• https://git.kernel.org/stable/c/90c49fce1c43e1cc152695e20363ff5087897c09
• https://git.kernel.org/stable/c/c511954bf142fe1995aec3c739a9f1a76990283a

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