CVE-2025-71128

{"id": "CVE-2025-71128", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "lessThan": "b282b2a9eed848587c1348abdd5d83fa346a2743", "versionType": "git"}, {"status": "affected", "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "lessThan": "35ddf66c65eff93fff91406756ba273600bf61a3", "versionType": "git"}], "programFiles": ["net/ipv4/ip_gre.c", "net/ipv6/ip6_gre.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"status": "unaffected", "version": "0", "lessThan": "6.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.4", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv4/ip_gre.c", "net/ipv6/ip6_gre.c"], "defaultStatus": "affected"}]}], "published": "2026-01-14T15:16:02.547", "references": [{"url": "https://git.kernel.org/stable/c/35ddf66c65eff93fff91406756ba273600bf61a3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b282b2a9eed848587c1348abdd5d83fa346a2743", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerspan: Initialize options_len before referencing options.\n\nThe struct ip_tunnel_info has a flexible array member named\noptions that is protected by a counted_by(options_len)\nattribute.\n\nThe compiler will use this information to enforce runtime bounds\nchecking deployed by FORTIFY_SOURCE string helpers.\n\nAs laid out in the GCC documentation, the counter must be\ninitialized before the first reference to the flexible array\nmember.\n\nAfter scanning through the files that use struct ip_tunnel_info\nand also refer to options or options_len, it appears the normal\ncase is to use the ip_tunnel_info_opts_set() helper.\n\nSaid helper would initialize options_len properly before copying\ndata into options, however in the GRE ERSPAN code a partial\nupdate is done, preventing the use of the helper function.\n\nBefore this change the handling of ERSPAN traffic in GRE tunnels\nwould cause a kernel panic when the kernel is compiled with\nGCC 15+ and having FORTIFY_SOURCE configured:\n\nmemcpy: detected buffer overflow: 4 byte write of buffer size 0\n\nCall Trace:\n <IRQ>\n __fortify_panic+0xd/0xf\n erspan_rcv.cold+0x68/0x83\n ? ip_route_input_slow+0x816/0x9d0\n gre_rcv+0x1b2/0x1c0\n gre_rcv+0x8e/0x100\n ? raw_v4_input+0x2a0/0x2b0\n ip_protocol_deliver_rcu+0x1ea/0x210\n ip_local_deliver_finish+0x86/0x110\n ip_local_deliver+0x65/0x110\n ? ip_rcv_finish_core+0xd6/0x360\n ip_rcv+0x186/0x1a0\n\nReported-at: https://launchpad.net/bugs/2129580"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nerspan: Inicializar options_len antes de referenciar options.\n\nLa struct ip_tunnel_info tiene un miembro de array flexible llamado options que est\u00e1 protegido por un atributo counted_by(options_len).\n\nEl compilador usar\u00e1 esta informaci\u00f3n para aplicar la comprobaci\u00f3n de l\u00edmites en tiempo de ejecuci\u00f3n implementada por los ayudantes de cadena de FORTIFY_SOURCE.\n\nComo se establece en la documentaci\u00f3n de GCC, el contador debe ser inicializado antes de la primera referencia al miembro de array flexible.\n\nDespu\u00e9s de escanear los archivos que usan la struct ip_tunnel_info y tambi\u00e9n se refieren a options o options_len, parece que el caso normal es usar el ayudante ip_tunnel_info_opts_set().\n\nDicho ayudante inicializar\u00eda options_len correctamente antes de copiar datos en options, sin embargo, en el c\u00f3digo GRE ERSPAN se realiza una actualizaci\u00f3n parcial, impidiendo el uso de la funci\u00f3n ayudante.\n\nAntes de este cambio, el manejo del tr\u00e1fico ERSPAN en t\u00faneles GRE causar\u00eda un p\u00e1nico del kernel cuando el kernel es compilado con GCC 15+ y teniendo FORTIFY_SOURCE configurado:\n\nmemcpy: desbordamiento de b\u00fafer detectado: escritura de 4 bytes en un b\u00fafer de tama\u00f1o 0\n\nTraza de Llamada:\n \n __fortify_panic+0xd/0xf\n erspan_rcv.cold+0x68/0x83\n ? ip_route_input_slow+0x816/0x9d0\n gre_rcv+0x1b2/0x1c0\n gre_rcv+0x8e/0x100\n ? raw_v4_input+0x2a0/0x2b0\n ip_protocol_deliver_rcu+0x1ea/0x210\n ip_local_deliver_finish+0x86/0x110\n ip_local_deliver+0x65/0x110\n ? ip_rcv_finish_core+0xd6/0x360\n ip_rcv+0x186/0x1a0\n\nReportado en: https://launchpad.net/bugs/2129580"}], "lastModified": "2026-06-17T10:03:43.307", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DD0A1B05-C008-4639-A2E7-32E5D447EA98", "versionEndExcluding": "6.18.4", "versionStartIncluding": "6.15.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A1ECC65A-EE37-4479-8E99-4BB68A22A31F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EB5B7DFC-C36B-45D8-922C-877569FDDF43"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}