CVE-2026-53268 (GCVE-0-2026-53268)
Vulnerability from cvelistv5
Published
2026-06-25 08:39
Modified
2026-08-05 12:34
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack_irc: fix possible out-of-bounds read When parsing fails after we've matched the command string we should bail out instead of trying to match a different command. This helper should be deprecated, given prevalence of TLS I doubt it has any relevance in 2026.
References
Impacted products
Vendor Product Version
Linux Linux Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
Version: 869f37d8e48f3911eb70f38a994feaa8f8380008
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_irc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.20"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
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                {
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                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
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                {
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                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
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                {
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                {
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                {
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "2.6.20",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack_irc: fix possible out-of-bounds read\n\nWhen parsing fails after we\u0027ve matched the command string we\nshould bail out instead of trying to match a different command.\n\nThis helper should be deprecated, given prevalence of TLS I doubt it has\nany relevance in 2026."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable IRC conntrack helper parses attacker-controlled TCP payloads on network flows when the helper is attached, such as an IRC-exposed host or firewall/NAT deployment. A remote peer can establish the TCP flow and send the crafted IRC/CTCP DCC text that reaches `help()`.\nAC:L - Once the helper is enabled/assigned, triggering is deterministic packet parsing with attacker-controlled payload bytes and no race or hard-to-shape kernel state. The established-flow requirement is attacker-controlled by completing a normal TCP handshake.\nPR:N - The network attacker does not need local credentials or authenticated IRC privileges to send payload on a tracked TCP connection. Helper configuration requires administrative privileges, but that is deployment state, not attacker privilege.\nUI:N - No victim user action is needed after the vulnerable helper is active on the network path. The attacker only sends network traffic.\nS:U - The impact is within the kernel/netfilter security authority of the affected system. There is no VM, IOMMU, or separate security-scope boundary crossed.\nC:L - This is an out-of-bounds read from the IRC payload buffer/parser state, but the overread is constrained by short command comparisons and parser checks rather than an arbitrary kernel memory read primitive. Under the higher-severity tie-break rule, limited confidentiality impact is appropriate for the possible stale/adjacent-byte exposure.\nI:N - The bug is a read-side parser bounds error and does not write attacker-controlled data to kernel memory or provide a direct modification primitive. Any conntrack expectation changes require passing the helper\u0027s normal DCC validation path and are not arbitrary integrity compromise.\nA:H - The malformed payload can drive `memcmp()`/parser reads beyond the valid copied payload window, and with large/nonlinear packets this can go past the helper\u0027s guard byte and plausibly fault/oops in kernel context. The packet can be resent repeatedly for denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:45.538Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a1d6e40dedfe1068aee094d851bd69e289c9fd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/0afc802160af0df61ed374fdb97fb34cfe5cdf2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea"
        },
        {
          "url": "https://git.kernel.org/stable/c/ddddd8271359961e403d11c90c9ba9fc38914f7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e5da2379f968a3ea5a6e38921ab6201576466dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176"
        },
        {
          "url": "https://git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56"
        }
      ],
      "title": "netfilter: conntrack_irc: fix possible out-of-bounds read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53268",
    "datePublished": "2026-06-25T08:39:54.511Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-08-05T12:34:45.538Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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