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netfilter: x_tables: guard option walkers against 1-byte tail reads

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.

Announced Source revision 1
Original source ↗

CVE-2026-43452

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-2026-43452

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": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "c2a445367a496a3c25dbc940c10c8bd1cfd4c14a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "ae1e1267650638136b84c23f2b31250f0ccb6823",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "c39f84e4be1be63fc60ca7141ea7b76edcea5907",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "9b94f0e42ed248eb31929da84ed9f5310d7ff540",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "bc18551c6169eac5ed813778d3e3e484002dbbe5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "d04800323336eebf441d153f43234eac9b833d36",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
        "lessThan": "cfe770220ac2dbd3e104c6b45094037455da81d4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/xt_dccp.c",
      "net/netfilter/xt_tcpudp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.19",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/xt_dccp.c",
      "net/netfilter/xt_tcpudp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43452

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40078 · Revision 1
Added to Heist Feed
Publisher date
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