CVE-2026-53268 netfilter: conntrack_irc: fix possible out-of-bounds read

[
  {
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netfilter/nf_conntrack_irc.c"
    ],
    "versions": [
      {
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  },
  {
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    "vendor": "Linux",
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netfilter/nf_conntrack_irc.c"
    ],
    "versions": [
      {
        "version": "2.6.20",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.20",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.259",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.210",
        "lessThanOrEqual": "5.15.*",
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      },
      {
        "version": "6.1.176",
        "lessThanOrEqual": "6.1.*",
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      },
      {
        "version": "6.6.143",
        "lessThanOrEqual": "6.6.*",
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      },
      {
        "version": "6.12.94",
        "lessThanOrEqual": "6.12.*",
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      },
      {
        "version": "6.18.36",
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      },
      {
        "version": "7.0.13",
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      },
      {
        "version": "7.1",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]