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CVE-2026-64413

HIGHCVSS 7/10EPSS 0.12%

Last modified

CVE-2026-64413 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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.. EPSS estimates a 0.12% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7/10

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

EPSS Probability
0.12%

2.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2ade612967e2cdfb9290ebcb773f302c82f311fa; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 42bef500d07b5769d916e9122a3e3fa3fd2245ef; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < fc7f105451044501a50cfd530cfa3b472c54acbc; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9e6c5169db423e51dcc66a73fd15409c0d38e088; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 29bf41a9b59aff9f6197df58641a00037d567ca8; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9f74d28e903fa4fdf82f870d0aeadddc8196e41c; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5ee856e4208acafaaaf7b84824d39b78c21345d6; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < cbfe53599eebffd188938ab6774cc41794f6f9d5
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64413?
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.
How severe is CVE-2026-64413?
CVE-2026-64413 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.12% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64413?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST