Vulnerability-Lookup

CVE-2026-53268 (GCVE-0-2026-53268)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:41

Title

netfilter: conntrack_irc: fix possible out-of-bounds read

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.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/4cdda7f868f48e2f8…
https://git.kernel.org/stable/c/8a1d6e40dedfe1068…
https://git.kernel.org/stable/c/0afc802160af0df61…
https://git.kernel.org/stable/c/7c34f913052920832…
https://git.kernel.org/stable/c/ddddd8271359961e4…
https://git.kernel.org/stable/c/9e5da2379f968a3ea…
https://git.kernel.org/stable/c/573810f61bcd6b681…
https://git.kernel.org/stable/c/66eba0ffce3b7e114…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 4cdda7f868f48e2f81579371584fdbdce37df2c8 (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 8a1d6e40dedfe1068aee094d851bd69e289c9fd6 (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 0afc802160af0df61ed374fdb97fb34cfe5cdf2f (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 7c34f91305292083253df6a9f6c8ede02d4ccaea (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < ddddd8271359961e403d11c90c9ba9fc38914f7e (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 9e5da2379f968a3ea5a6e38921ab6201576466dc (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 573810f61bcd6b6815e2ff53bbdd2b9c9d747176 (git) Affected: 869f37d8e48f3911eb70f38a994feaa8f8380008 , < 66eba0ffce3b7e11449946b4cbbef8ea36112f56 (git)
Linux	Linux	Affected: 2.6.20 Unaffected: 0 , < 2.6.20 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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        }
      ],
      "metrics": [
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            "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"
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    "datePublished": "2026-06-25T08:39:54.511Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-06-28T06:41:12.729Z",
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2026.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nf_conntrack_irc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"4cdda7f868f48e2f81579371584fdbdce37df2c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"8a1d6e40dedfe1068aee094d851bd69e289c9fd6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"0afc802160af0df61ed374fdb97fb34cfe5cdf2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"7c34f91305292083253df6a9f6c8ede02d4ccaea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"ddddd8271359961e403d11c90c9ba9fc38914f7e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"9e5da2379f968a3ea5a6e38921ab6201576466dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"573810f61bcd6b6815e2ff53bbdd2b9c9d747176\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"869f37d8e48f3911eb70f38a994feaa8f8380008\",\"lessThan\":\"66eba0ffce3b7e11449946b4cbbef8ea36112f56\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nf_conntrack_irc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.20\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.20\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0afc802160af0df61ed374fdb97fb34cfe5cdf2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a1d6e40dedfe1068aee094d851bd69e289c9fd6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9e5da2379f968a3ea5a6e38921ab6201576466dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddddd8271359961e403d11c90c9ba9fc38914f7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

GHSA-3J2M-3XQ8-9948

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31

Details

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.

Severity

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-53268"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:44Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-3j2m-3xq8-9948",
  "modified": "2026-06-28T09:31:47Z",
  "published": "2026-06-25T09:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53268"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0afc802160af0df61ed374fdb97fb34cfe5cdf2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8"
    },
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      "url": "https://git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a1d6e40dedfe1068aee094d851bd69e289c9fd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e5da2379f968a3ea5a6e38921ab6201576466dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddddd8271359961e403d11c90c9ba9fc38914f7e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-53268

Vulnerability from csaf_microsoft - Published: 2026-06-02 00:00 - Updated: 2026-06-28 01:47

Summary

netfilter: conntrack_irc: fix possible out-of-bounds read

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-53268

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 21443-17084		—

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	Vendor Fix fix

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-53268 netfilter: conntrack_irc: fix possible out-of-bounds read - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53268.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "netfilter: conntrack_irc: fix possible out-of-bounds read",
    "tracking": {
      "current_release_date": "2026-06-28T01:47:42.000Z",
      "generator": {
        "date": "2026-06-28T07:10:57.280Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-53268",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-06-27T01:15:53.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-06-28T01:47:42.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cazl3 kernel 0:6.6.141.1-1.azl3",
                "product": {
                  "name": "\u003cazl3 kernel 0:6.6.141.1-1.azl3",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 kernel 0:6.6.141.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.141.1-1.azl3",
                  "product_id": "21443"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "\u003cazl3 kernel 0:6.6.141.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.141.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "21443-17084"
        },
        "product_reference": "21443",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-53268",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "21443-17084"
        ],
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-53268 netfilter: conntrack_irc: fix possible out-of-bounds read - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53268.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-27T01:15:53.000Z",
          "details": "0:6.6.143.1-1.azl3:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "title": "netfilter: conntrack_irc: fix possible out-of-bounds read"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-53268 (GCVE-0-2026-53268)

GHSA-3J2M-3XQ8-9948

MSRC_CVE-2026-53268

Tags

Sightings

Nomenclature