CVE-2023-52527

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This can happen under some\ncircumstances, such as splicing into an L2TP socket.\n\nThe symptom observed is a warning in __ip6_append_data():\n\n WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\n\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\npartially occupied skbuff. The warning occurs when 'copy' is larger than\nthe amount of data in the message iterator. This is because the requested\nlength includes the transport header length when it shouldn't. This can be\ntriggered by, for example:\n\n sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP);\n bind(sfd, ...); // ::1\n connect(sfd, ...); // ::1 port 7\n send(sfd, buffer, 4100, MSG_MORE);\n sendfile(sfd, dfd, NULL, 1024);\n\nFix this by only adding transhdrlen into the length if the write queue is\nempty in l2tp_ip6_sendmsg(), analogously to how UDP does things.\n\nl2tp_ip_sendmsg() looks like it won't suffer from this problem as it builds\nthe UDP packet itself."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/l2tp/l2tp_ip6.c"], "versions": [{"version": "a32e0eec7042b21ccb52896cf715e3e2641fed93", "lessThan": "7626b9fed53092aa2147978070e610ecb61af844", "status": "affected", "versionType": "git"}, {"version": "a32e0eec7042b21ccb52896cf715e3e2641fed93", "lessThan": "559d697c5d072593d22b3e0bd8b8081108aeaf59", "status": "affected", "versionType": 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This can happen under some\ncircumstances, such as splicing into an L2TP socket.\n\nThe symptom observed is a warning in __ip6_append_data():\n\n WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\n\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\npartially occupied skbuff. The warning occurs when 'copy' is larger than\nthe amount of data in the message iterator. This is because the requested\nlength includes the transport header length when it shouldn't. 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"5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "830A824C-F212-4FDC-ADEF-0EBEC6B2365B", "versionEndExcluding": "6.5.7", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:*", "matchCriteriaId": "84267A4F-DBC2-444F-B41D-69E15E1BEC97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:*", "matchCriteriaId": "FB440208-241C-4246-9A83-C1715C0DAA6C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:*", "matchCriteriaId": "0DC421F1-3D5A-4BEF-BF76-4E468985D20B", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc4:*:*:*:*:*:*", "matchCriteriaId": "00AB783B-BE05-40E8-9A55-6AA457D95031", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()\n\nIncluding the transhdrlen in length is a problem when the packet is\npartially filled (e.g. something like send(MSG_MORE) happened previously)\nwhen appending to an IPv4 or IPv6 packet as we don't want to repeat the\ntransport header or account for it twice. This can happen under some\ncircumstances, such as splicing into an L2TP socket.\n\nThe symptom observed is a warning in __ip6_append_data():\n\n WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\n\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\npartially occupied skbuff. The warning occurs when 'copy' is larger than\nthe amount of data in the message iterator. This is because the requested\nlength includes the transport header length when it shouldn't. This can be\ntriggered by, for example:\n\n sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP);\n bind(sfd, ...); // ::1\n connect(sfd, ...); // ::1 port 7\n send(sfd, buffer, 4100, MSG_MORE);\n sendfile(sfd, dfd, NULL, 1024);\n\nFix this by only adding transhdrlen into the length if the write queue is\nempty in l2tp_ip6_sendmsg(), analogously to how UDP does things.\n\nl2tp_ip_sendmsg() looks like it won't suffer from this problem as it builds\nthe UDP packet itself."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv4, ipv6: se corrigi\u00f3 el manejo de transhdrlen en __ip{,6}_append_data() Incluir el transhdrlen en longitud es un problema cuando el paquete est\u00e1 parcialmente lleno (por ejemplo, algo como enviar(MSG_MORE ) sucedi\u00f3 anteriormente) al agregarlo a un paquete IPv4 o IPv6, ya que no queremos repetir el encabezado de transporte ni contabilizarlo dos veces. Esto puede suceder en algunas circunstancias, como al realizar un empalme en un z\u00f3calo L2TP. El s\u00edntoma observado es una advertencia en __ip6_append_data(): ADVERTENCIA: CPU: 1 PID: 5042 en net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800 que ocurre cuando MSG_SPLICE_PAGES se utiliza para agregar m\u00e1s datos a un skbuff que ya est\u00e1 parcialmente ocupado. La advertencia se produce cuando 'copiar' es mayor que la cantidad de datos en el iterador del mensaje. Esto se debe a que la longitud solicitada incluye la longitud del encabezado de transporte cuando no deber\u00eda hacerlo. Esto puede desencadenarse, por ejemplo: sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP); enlazar(sfd, ...); // ::1 conectar(sfd, ...); // ::1 puerto 7 enviar(sfd, buffer, 4100, MSG_MORE); enviar archivo (sfd, dfd, NULL, 1024); Solucione este problema agregando solo transhdrlen a la longitud si la cola de escritura est\u00e1 vac\u00eda en l2tp_ip6_sendmsg(), de manera an\u00e1loga a c\u00f3mo hace las cosas UDP. Parece que l2tp_ip_sendmsg() no sufrir\u00e1 este problema ya que construye el paquete UDP por s\u00ed mismo."}], "id": "CVE-2023-52527", "lastModified": "2026-06-17T06:42:56.220", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52527", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-07T20:08:11.890861Z", "version": "2.0.3"}}]}, "published": "2024-03-02T22:15:48.403", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()", "id": "2267790", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267790"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()\nIncluding the transhdrlen in length is a problem when the packet is\npartially filled (e.g. something like send(MSG_MORE) happened previously)\nwhen appending to an IPv4 or IPv6 packet as we don't want to repeat the\ntransport header or account for it twice. This can happen under some\ncircumstances, such as splicing into an L2TP socket.\nThe symptom observed is a warning in __ip6_append_data():\nWARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\npartially occupied skbuff. The warning occurs when 'copy' is larger than\nthe amount of data in the message iterator. This is because the requested\nlength includes the transport header length when it shouldn't. This can be\ntriggered by, for example:\nsfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP);\nbind(sfd, ...); // ::1\nconnect(sfd, ...); // ::1 port 7\nsend(sfd, buffer, 4100, MSG_MORE);\nsendfile(sfd, dfd, NULL, 1024);\nFix this by only adding transhdrlen into the length if the write queue is\nempty in l2tp_ip6_sendmsg(), analogously to how UDP does things.\nl2tp_ip_sendmsg() looks like it won't suffer from this problem as it builds\nthe UDP packet itself.", "A flaw was found in of the Linux kernel's lt2p component, where the transport header length is erroneously included when appending data to IPv4 and IPv6 packets, specifically in situations where the packet is already partially filled, potentially affecting the stability of network operations."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2023-52527", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52527\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52527\nhttps://lore.kernel.org/linux-cve-announce/2024030254-CVE-2023-52527-a1e8@gregkh/T/#u"], "statement": "Red Hat Enterprise Linux 8 and 9 are not affected by this vulnerability.", "threat_severity": "Moderate"}

{}