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netfilter: reject zero shift in nft_bitwise

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-46101

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46101

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "9baa08d6b6b096fad70049533f0d705d85fdc979",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "4fccea585631621c975883911a08d15b6671f7dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "9ad26c272405f53834871cc2e46b9b5393a666c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "bffef0acec9c3b837a785248a893137fb7f26c95",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "ca24f1243ad1a4d12d6a23876bbbe3ed02099853",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "6f820139d16a4c9865a145d4a9cf9c92cc632c14",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "f370205974f171a5868c13ff30d7642fed46e47b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
        "lessThan": "fe11e5c40817b84abaa5d83bfb6586d8412bfd07",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_bitwise.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_bitwise.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46101

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28389 · Revision 1
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Publisher date
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