Vulnerability-Lookup

GHSA-8X7W-42Q6-MV4P

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46101"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:32Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-8x7w-42q6-mv4p",
  "modified": "2026-05-27T15:33:24Z",
  "published": "2026-05-27T15:33:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46101"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46101 (GCVE-0-2026-46101)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:59 – Updated: 2026-05-27 12:59

Title

netfilter: reject zero shift in nft_bitwise

Summary

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.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/bffef0acec9c3b837…
https://git.kernel.org/stable/c/ca24f1243ad1a4d12…
https://git.kernel.org/stable/c/6f820139d16a4c986…
https://git.kernel.org/stable/c/f370205974f171a58…
https://git.kernel.org/stable/c/fe11e5c40817b84ab…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 , < bffef0acec9c3b837a785248a893137fb7f26c95 (git) Affected: 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 , < ca24f1243ad1a4d12d6a23876bbbe3ed02099853 (git) Affected: 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 , < 6f820139d16a4c9865a145d4a9cf9c92cc632c14 (git) Affected: 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 , < f370205974f171a5868c13ff30d7642fed46e47b (git) Affected: 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 , < fe11e5c40817b84abaa5d83bfb6586d8412bfd07 (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc2 , ≤ * (original_commit_for_fix)

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{
  "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": "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": "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": "6.6.140",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
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                },
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                }
              ],
              "negate": false,
              "operator": "OR"
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      "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": "2026-05-27T12:59:08.220Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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": "2026-05-27T12:59:08.220Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-8X7W-42Q6-MV4P

CVE-2026-46101 (GCVE-0-2026-46101)

Tags

Sightings

Nomenclature