{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53268", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.395Z", "datePublished": "2026-06-25T08:39:54.511Z", "dateUpdated": "2026-08-05T12:34:45.538Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:45.538Z" }, "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've 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": { "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" }, "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's 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's guard byte and plausibly fault/oops in kernel context. The packet can be resent repeatedly for denial of service." } ] } ], "affected": [ { "product": "Linux", "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": [ { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "4cdda7f868f48e2f81579371584fdbdce37df2c8", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "8a1d6e40dedfe1068aee094d851bd69e289c9fd6", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "0afc802160af0df61ed374fdb97fb34cfe5cdf2f", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "7c34f91305292083253df6a9f6c8ede02d4ccaea", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "ddddd8271359961e403d11c90c9ba9fc38914f7e", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "9e5da2379f968a3ea5a6e38921ab6201576466dc", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "573810f61bcd6b6815e2ff53bbdd2b9c9d747176", "status": "affected", "versionType": "git" }, { "version": "869f37d8e48f3911eb70f38a994feaa8f8380008", "lessThan": "66eba0ffce3b7e11449946b4cbbef8ea36112f56", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "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.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "7.1" } ] } ] } ], "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" } } } }