What’s Vulnerable › Vulnerabilities

CVE-2026-74564: netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH The XT_HASHLIMIT_RATE_MATCH flag mode changes the semantics of the dsthash_ent structure which represents an entry in the hashtable. There is a union area which uses a different layout to express the rate match mode. Update .checkentry path to validate the XT_HASHLIMIT_RATE_MATCH mode flag is requested by two or more different rules that refer to the same hashtable. Otherwise, uninitialized access to the burst field in the union is possible. Reject the use of the XT_HASHLIMIT_RATE_MATCH mode flag if set on by revision less than 3 too.

Affected products

• Linux kernel: 4.14 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/06a76334243ccd875a981aa8bb46c0f931ef1e3b
• https://git.kernel.org/stable/c/24683fea1f06bd3bd2707b99460e859bc6464c22
• https://git.kernel.org/stable/c/305b63e1402267459fdabb183af4527f6799eebf
• https://git.kernel.org/stable/c/32ec8d4aba2cf22e12bdc28df8c4bd833c195fc0
• https://git.kernel.org/stable/c/402befce5854c195058cf4bab7c78ca286068a26
• https://git.kernel.org/stable/c/d186f77d18bdfb252d401ff992ca3001a6a65a0f
• https://git.kernel.org/stable/c/dee686b5e7f21180538ff719867702f411c8eb5c
• https://git.kernel.org/stable/c/f76ab783e7d8d33e33dd7dfa697297f70d57b0e8

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