Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.6, < 5.10.258 |
References
- https://git.kernel.org/stable/c/4fccea585631621c975883911a08d15b6671f7dcPatch
- https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14Patch
- https://git.kernel.org/stable/c/9ad26c272405f53834871cc2e46b9b5393a666c3Patch
- https://git.kernel.org/stable/c/9baa08d6b6b096fad70049533f0d705d85fdc979Patch
- https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95Patch
- https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853Patch
- https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47bPatch
- https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07Patch
FAQ
What is CVE-2026-46101?
CVE-2026-46101 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ini...
How severe is CVE-2026-46101?
CVE-2026-46101 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46101?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.