Medium 5.5Published May 27, 2026

CVE-2026-46101netfilter: reject zero shift in nft_bitwise

Updated under an hour ago (Oct 27, 2026, 6:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: netfilter: reject zero shift in nft_bitwise Reject zero shift operands for nft_bitwise left and right shift expressions during initialization. The carry propagation logic computes the carry from the adjacent 32-bit word using BITS_PER_TYPE(u32) - shift. A zero shift operand turns this into a 32-bit shift, which is undefined behaviour. Reject zero shift operands in the control plane, alongside the existing check for values greater than or equal to 32, so malformed rules never reach the packet path.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
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 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	567d746b55bc66d3800c9ae91d50f0c5deb2fd93 builds before 9baa08d6b6b096fad70049533f0d705d85fdc979; 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 builds before 4fccea585631621c975883911a08d15b6671f7dc; 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 builds before 9ad26c272405f53834871cc2e46b9b5393a666c3; from 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 before bffef0acec9c3b837a785248a893137fb7f26c95; from 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 before ca24f1243ad1a4d12d6a23876bbbe3ed02099853; 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 builds before 6f820139d16a4c9865a145d4a9cf9c92cc632c14; from 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 before f370205974f171a5868c13ff30d7642fed46e47b; from 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 before fe11e5c40817b84abaa5d83bfb6586d8412bfd07	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 SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	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 5.6 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27; from 6.19 before 7.0.4; 7.1	NVD

References

References

https://git.kernel.org/stable/c/9baa08d6b6b096fad70049533f0d705d85fdc979	patch
https://git.kernel.org/stable/c/4fccea585631621c975883911a08d15b6671f7dc	patch
https://git.kernel.org/stable/c/9ad26c272405f53834871cc2e46b9b5393a666c3	patch
https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95	patch
https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853	patch
https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14	patch
https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b	patch
https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
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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.