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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53268\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:44.883\",\"lastModified\":\"2026-07-08T04:01:54.120\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"}],\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.20\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"03DC6215-FFBD-4E60-BBBC-37C4F9A1E6EF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.210\",\"matchCriteriaId\":\"5E938CDF-D1C4-43D0-98DC-9E11B6B55801\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"C4446623-5F2B-4DD8-8666-9FAAC285A757\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"85421C0C-ABDE-4357-971C-67F9087DE1B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.36\",\"matchCriteriaId\":\"389025D2-958D-41BD-BD96-70ED1033A9F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:li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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-26T09:46:37+00:00",
      "cve": "CVE-2026-53268",
      "id": "CVE-2026-53268",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:fixed": "303",
      "product_status:known_affected": "188",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: conntrack_irc: fix possible out-of-bounds read",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53268.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-21T00:54:09Z",
      "cve": "CVE-2026-53268",
      "id": "CVE-2026-53268",
      "initial_release_date": "2026-06-26T02:08:02Z",
      "product_status:first_fixed": "55",
      "product_status:known_affected": "596",
      "product_status:recommended": "210",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53268",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53268.json",
      "version": "9"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.