CVE-2026-53268

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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": 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{"bugzilla": {"description": "kernel: netfilter: conntrack_irc: fix possible out-of-bounds read", "id": "2492770", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492770"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's netfilter conntrack_irc module. This vulnerability allows for a possible out-of-bounds read. When parsing network traffic, if a command string is matched but subsequent parsing fails, the system does not properly exit, leading to the flaw. This could potentially allow an attacker to cause a denial of service or disclose sensitive information."], "name": "CVE-2026-53268", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53268\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53268\nhttps://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53268-9545@gregkh/T"], "threat_severity": "Moderate"}

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