High 7.0Published Jul 25, 2026

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

Updated under an hour ago (Oct 26, 2026, 12:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-457
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2ade612967e2cdfb9290ebcb773f302c82f311fa; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 42bef500d07b5769d916e9122a3e3fa3fd2245ef; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fc7f105451044501a50cfd530cfa3b472c54acbc; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9e6c5169db423e51dcc66a73fd15409c0d38e088; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 29bf41a9b59aff9f6197df58641a00037d567ca8; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9f74d28e903fa4fdf82f870d0aeadddc8196e41c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5ee856e4208acafaaaf7b84824d39b78c21345d6; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cbfe53599eebffd188938ab6774cc41794f6f9d5	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.97; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 2.6.12; and 6 more ranges	NVD

References

References

https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa	patch
https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef	patch
https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc	patch
https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088	patch
https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8	patch
https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c	patch
https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6	patch
https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.