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Vulnerability record · CVE-2026-64413 · published 25 July 2026

CVE-2026-64413: Linux kernel use of uninitialized resource vulnerability

Linux · Linux Kernel

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.

7.0 CVSS 3.1 High EPSS 0.16% · top 95.7% CWE-908 · Use of uninitialized resource
7.0CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8 Patch
https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa Patch
https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef Patch
https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6 Patch
https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088 Patch
https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c Patch
https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5 Patch
https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html

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Source: NIST National Vulnerability Database (record CVE-2026-64413), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.