Vulnerability-Lookup

FKIE_CVE-2026-46101

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48

Severity

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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-46101",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:32.147",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

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

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)

Show details on NVD website

JSON

To clipboard

{
  "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
                },
                {
                  "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": "2026-05-27T12:59:08.220Z",
        "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

FKIE_CVE-2026-46101

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

Tags

Sightings

Nomenclature