What’s Vulnerable › Vulnerabilities

CVE-2024-56729: smb: Initialize cfid->tcon before performing network ops

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-29 · updated 2026-10-30
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: smb: Initialize cfid->tcon before performing network ops Avoid leaking a tcon ref when a lease break races with opening the cached directory. Processing the leak break might take a reference to the tcon in cached_dir_lease_break() and then fail to release the ref in cached_dir_offload_close, since cfid->tcon is still NULL.

Affected products

• Linux kernel: from 6.1 before 6.6.64; from 6.7 before 6.11.11; from 6.12 before 6.12.2 — fixed in 6.6.64, 6.11.11, 6.12.2
• Linux: 6.1 — fixed in 6.13

How to fix

Upgrade to a fixed version: Linux kernel 6.6.64, 6.11.11, 6.12.2; Linux 6.13. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1b9ab6b648f89441c8a13cb3fd8ca83ffebc5262
• https://git.kernel.org/stable/c/269ff24a5b2b58600151e04e964d2043bfe1843c
• https://git.kernel.org/stable/c/4b216c8f9c7d84ef7de33ca60b97e08e03ef3292
• https://git.kernel.org/stable/c/625e2357c8fcfae6e66dcc667dc656fe390bab15
• https://git.kernel.org/stable/c/c353ee4fb119a2582d0e011f66a76a38f5cf984d

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