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7.1
HIGH CVSS 3.1
CVE-2026-74564
netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH
Overview
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.

Details
INFO

Published Date :

Aug. 15, 2026, 1:18 p.m.

Last Modified :

Aug. 19, 2026, 5:21 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
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.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Update kernel to validate hashtable rate match flag usage and reject older revisions.
  • 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
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.

URL Resource
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
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.

Results are limited to the first 20 news articles due to potential performance issues.

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.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 19, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/402befce5854c195058cf4bab7c78ca286068a26
    Added Reference https://git.kernel.org/stable/c/dee686b5e7f21180538ff719867702f411c8eb5c
    Added Reference https://git.kernel.org/stable/c/f76ab783e7d8d33e33dd7dfa697297f70d57b0e8
    Changed 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', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_hashlimit.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': '402befce5854c195058cf4bab7c78ca286068a26', 'versionType': 'git'}, {'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': 'dee686b5e7f21180538ff719867702f411c8eb5c', 'versionType': 'git'}, {'status': 'affected', 'version': 'bea74641e3786d51dcf1175527cc1781420961c9', 'lessThan': 'f76ab783e7d8d33e33dd7dfa697297f70d57b0e8', 'versionType': 'git'}, {'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': '5.10.265', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'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', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_hashlimit.c'], 'defaultStatus': 'affected'}]
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    Changed 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'}] [{'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', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_hashlimit.c'], 'defaultStatus': 'affected'}]
  • 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
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact