CVE-2026-74564
netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH
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.
INFO
Published Date :
Aug. 15, 2026, 1:18 p.m.
Last Modified :
Aug. 15, 2026, 1:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74564
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the resolved version.
- Ensure hashtable rate match flags are validated correctly.
- Reject rate match flags set by revision less than 3.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74564.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74564 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74564
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74564 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74564 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': '24683fea1f06bd3bd2707b99460e859bc6464c22', 'versionType': 'git'}, {'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': '32ec8d4aba2cf22e12bdc28df8c4bd833c195fc0', 'versionType': 'git'}, {'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': 'd186f77d18bdfb252d401ff992ca3001a6a65a0f', 'versionType': 'git'}, {'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': '06a76334243ccd875a981aa8bb46c0f931ef1e3b', 'versionType': 'git'}, {'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': '305b63e1402267459fdabb183af4527f6799eebf', 'versionType': 'git'}], 'programFiles': ['net/netfilter/xt_hashlimit.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_hashlimit.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/06a76334243ccd875a981aa8bb46c0f931ef1e3b Added Reference https://git.kernel.org/stable/c/24683fea1f06bd3bd2707b99460e859bc6464c22 Added Reference https://git.kernel.org/stable/c/305b63e1402267459fdabb183af4527f6799eebf Added Reference https://git.kernel.org/stable/c/32ec8d4aba2cf22e12bdc28df8c4bd833c195fc0 Added Reference https://git.kernel.org/stable/c/d186f77d18bdfb252d401ff992ca3001a6a65a0f