CVE-2026-46101netfilter: reject zero shift in nft_bitwise
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
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
- https://git.kernel.org/stable/c/9baa08d6b6b096fad70049533f0d705d85fdc979patch
- https://git.kernel.org/stable/c/4fccea585631621c975883911a08d15b6671f7dcpatch
- https://git.kernel.org/stable/c/9ad26c272405f53834871cc2e46b9b5393a666c3patch
- https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95patch
- https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853patch
- https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14patch
- https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47bpatch
- https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.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.