CVE-2026-46101netfilter: reject zero shift in nft_bitwise
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < 9baa08d6b6b096fad70049533f0d705d85fdc979
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < 4fccea585631621c975883911a08d15b6671f7dc
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < 9ad26c272405f53834871cc2e46b9b5393a666c3
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < bffef0acec9c3b837a785248a893137fb7f26c95
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < ca24f1243ad1a4d12d6a23876bbbe3ed02099853
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < 6f820139d16a4c9865a145d4a9cf9c92cc632c14
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < f370205974f171a5868c13ff30d7642fed46e47b
- affected 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 – < fe11e5c40817b84abaa5d83bfb6586d8412bfd07
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.86 – ≤ 6.12.*
- unaffected 6.18.27 – ≤ 6.18.*
- unaffected 7.0.4 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References11
- https://git.kernel.org/stable/c/9baa08d6b6b096fad70049533f0d705d85fdc979 (opens in a new tab)
- https://git.kernel.org/stable/c/4fccea585631621c975883911a08d15b6671f7dc (opens in a new tab)
- https://git.kernel.org/stable/c/9ad26c272405f53834871cc2e46b9b5393a666c3 (opens in a new tab)
- https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95 (opens in a new tab)
- https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853 (opens in a new tab)
- https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14 (opens in a new tab)
- https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b (opens in a new tab)
- https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32484 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-46101)Record last updated .