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CVE-2026-46101

📛 CVE Title

netfilter: reject zero shift in nft_bitwise

⬇ Download JSON ⚠ View as Threat

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.

Overview

State
PUBLISHED
Assigner (CNA)
Linux
CVSS severity
critical
CVSS score
CVSS 9.1 / 10 9.1 9.1 / 10
CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Effective score
9.1 / 10 CRITICAL source: CNA overview
MSRC score
5.5 / 10 MEDIUM MS rating: Moderate
CWE(s)
—
Reserved
2026-05-13
Published
2026-05-27 12:59 UTC
Last updated
2026-06-01 16:18 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/46xxx/CVE-2026-46101.json
Linked Threat
CVE-2026-46101 — CVE-2026-46101

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-27 14:17:32 UTC
NVD last modified
2026-06-25 21:18:10 UTC
NVD CVSS v3.1
CVSS 5.5 / 10 5.5 5.5 / 10 MEDIUM source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
1.8 / 10
Impact subscore
3.6 / 10
EPSS score
0.0012 (probability of exploitation in next 30 days)
EPSS percentile
2.43% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD / KEV / EPSS data refreshed 2026-08-01 17:10 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-32484
Assigner
Linux
Published
May 27, 2026, 12:59:08 PM
Updated
Jun 14, 2026, 5:54:30 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.1200
Vendors
Linux
Products
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <9baa08d6b6b096fad70049533f0d705d85fdc979)
Linux (patch: 5.15.209)
Linux (patch: 6.6.140)
Linux (patch: 5.10.258)
Linux (patch: 6.1.175)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <4fccea585631621c975883911a08d15b6671f7dc)
Linux (5.6)
Linux (patch: 0)
Linux (patch: 7.0.4)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <fe11e5c40817b84abaa5d83bfb6586d8412bfd07)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <9ad26c272405f53834871cc2e46b9b5393a666c3)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <ca24f1243ad1a4d12d6a23876bbbe3ed02099853)
Linux (patch: 6.12.86)
Linux (patch: 7.1)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <bffef0acec9c3b837a785248a893137fb7f26c95)
Linux (patch: 6.18.27)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <6f820139d16a4c9865a145d4a9cf9c92cc632c14)
Linux (567d746b55bc66d3800c9ae91d50f0c5deb2fd93 <f370205974f171a5868c13ff30d7642fed46e47b)
Aliases
GHSA-8x7w-42q6-mv4p

ENISA 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.

EUVD references (8)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-12 01:09 UTC (source: CVRF).

MS severity
Moderate
MS CVSS base score
5.5 / 10 (temporal 5.5)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Release
2026-May
Microsoft remediations / KB articles (2)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected), 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 (affected) —
Linux Linux 5.6 (affected), 0 (unaffected), 5.10.258 (unaffected), 5.15.209 (unaffected), 6.1.175 (unaffected), 6.6.140 (unaffected), 6.12.86 (unaffected), 6.18.27 (unaffected), 7.0.4 (unaffected), 7.1-rc2 (unaffected) —

Affected products — CPE 2.3 (2) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*

Vendor references (8)

References embedded in the original CVE record by the assigning CNA.

Web references (13)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (8)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (18)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-46101.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_bitwise.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9baa08d6b6b096fad70049533f0d705d85fdc979",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "4fccea585631621c975883911a08d15b6671f7dc",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "9ad26c272405f53834871cc2e46b9b5393a666c3",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "bffef0acec9c3b837a785248a893137fb7f26c95",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "ca24f1243ad1a4d12d6a23876bbbe3ed02099853",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "6f820139d16a4c9865a145d4a9cf9c92cc632c14",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "f370205974f171a5868c13ff30d7642fed46e47b",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            },
            {
              "lessThan": "fe11e5c40817b84abaa5d83bfb6586d8412bfd07",
              "status": "affected",
              "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_bitwise.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.86",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.27",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc2",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: reject zero shift in nft_bitwise\n\nReject zero shift operands for nft_bitwise left and right shift\nexpressions during initialization.\n\nThe carry propagation logic computes the carry from the adjacent 32-bit\nword using BITS_PER_TYPE(u32) - shift. A zero shift operand turns this\ninto a 32-bit shift, which is undefined behaviour.\n\nReject zero shift operands in the control plane, alongside the existing\ncheck for values greater than or equal to 32, so malformed rules never\nreach the packet path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:18:18.099Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9baa08d6b6b096fad70049533f0d705d85fdc979"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fccea585631621c975883911a08d15b6671f7dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ad26c272405f53834871cc2e46b9b5393a666c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14"
        },
        {
          "url": "https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07"
        }
      ],
      "title": "netfilter: reject zero shift in nft_bitwise",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46101",
    "datePublished": "2026-05-27T12:59:08.220Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-06-01T16:18:18.099Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}