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CVE-2026-64413
netfilter: ebtables: zero chainstack array
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place.

Details
INFO

Published Date :

July 25, 2026, 10:17 a.m.

Last Modified :

July 25, 2026, 10:17 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64413 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

: Total Affected Vendor : 0 | Products : 0
Solution
Update the Linux kernel to address a memory corruption vulnerability in netfilter: ebtables.
  • Update the Linux kernel to the latest version.
  • Apply the netfilter: ebtables patch.
  • Reboot the system after updating.
  • Verify the patch installation.
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-2026-64413.

URL Resource
https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8
https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa
https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef
https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6
https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088
https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c
https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5
https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64413 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-2026-64413 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-2026-64413 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-2026-64413 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.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 25, 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': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '2ade612967e2cdfb9290ebcb773f302c82f311fa', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '42bef500d07b5769d916e9122a3e3fa3fd2245ef', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'fc7f105451044501a50cfd530cfa3b472c54acbc', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '9e6c5169db423e51dcc66a73fd15409c0d38e088', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '29bf41a9b59aff9f6197df58641a00037d567ca8', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '9f74d28e903fa4fdf82f870d0aeadddc8196e41c', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '5ee856e4208acafaaaf7b84824d39b78c21345d6', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'cbfe53599eebffd188938ab6774cc41794f6f9d5', 'versionType': 'git'}], 'programFiles': ['net/bridge/netfilter/ebtables.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bridge/netfilter/ebtables.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place.
    Added Reference https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8
    Added Reference https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa
    Added Reference https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef
    Added Reference https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6
    Added Reference https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088
    Added Reference https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c
    Added Reference https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5
    Added Reference https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc
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
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