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netfilter: xt_u32: reject invalid shift counts

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.

Announced Source revision 1
Original source ↗

CVE-2026-72350

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-2026-72350

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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "ca7c92d9701249e6daf132087756a88cbf2bb2a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "b33b44250d57ab0e5a1e2571b5285fb0d0a7f382",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "728f479dc0447ae7eaef87926ff49142e415a811",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "0a8b7a6d763775709c601f584e709ae48bcc000a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "cce42014415cecd98aa49b3950e7b02ee7c81268",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "a597a722fb71a534138c20359b655726622b5f17",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "00d034fe8230dfc5832fe011ff2d81c1a2cc7a29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
        "lessThan": "64cdf7d30ac18e43df6c48004435febb965809a8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/xt_u32.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.23"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.23",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/xt_u32.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72350

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33034 · Revision 1
Added to Heist Feed
Publisher date
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