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CVE-2026-72350 netfilter: xt_u32: reject invalid shift counts

🗓️ 15 Aug 2026 05:55:53Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 23 Views

Linux kernel u32 match allows shift counts of 32+, causing undefined behavior during packet evaluation.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netfilter/xt_u32.c"
    ],
    "versions": [
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "ca7c92d9701249e6daf132087756a88cbf2bb2a3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "b33b44250d57ab0e5a1e2571b5285fb0d0a7f382",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "728f479dc0447ae7eaef87926ff49142e415a811",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "0a8b7a6d763775709c601f584e709ae48bcc000a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "cce42014415cecd98aa49b3950e7b02ee7c81268",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "a597a722fb71a534138c20359b655726622b5f17",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "00d034fe8230dfc5832fe011ff2d81c1a2cc7a29",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "64cdf7d30ac18e43df6c48004435febb965809a8",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netfilter/xt_u32.c"
    ],
    "versions": [
      {
        "version": "2.6.23",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.23",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.261",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.212",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.178",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.145",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.97",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.40",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.5",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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17 Aug 2026 05:43Current
CVSS 3.17.8
EPSS0.00176
23