{"api_version":"1","generated_at":"2026-07-24T18:35:25+00:00","cve":"CVE-2026-64047","urls":{"html":"https://cve.report/CVE-2026-64047","api":"https://cve.report/api/cve/CVE-2026-64047.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64047","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64047"},"summary":{"title":"net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end < sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n  struct sk_msg_sg {\n        [...]\n        /* The extra two elements:\n         * 1) used for chaining the front and sections when the list becomes\n         *    partitioned (e.g. end < start). The crypto APIs require the\n         *    chaining;\n         * 2) to chain tailer SG entries after the message.\n         */\n        struct scatterlist              data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n    sg_chain(&msg_pl->sg.data[msg_pl->sg.start],\n             MAX_SKB_FRAGS - msg_pl->sg.start + 1,\n             msg_pl->sg.data);\n\nThis places the chain pointer at\n\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n  &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n  data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n  data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:45","updated_at":"2026-07-20 15:17:05"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520","name":"https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd","name":"https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a","name":"https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d","name":"https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc","name":"https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628","name":"https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97","name":"https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522","name":"https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64047","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64047","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 73963a375885d5ccb7def39fd0b4f542e0f343dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 47110c3a9ac247b688657337f5981efcfcb240dc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 84158c2997159df4a0d70cd9c46774512d32a522 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 131ef12057d92b77b636321b7849c69222405a97 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 66339b71f105e6f83e0da3b9583d95077534fe1d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec eca989eab4b2599dcb02f72140a7c08f08838520 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 2fb0dc7e0099686c4e9d2732745d8a31b18c3628 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec 285943c6e7ca309bbea84b253745154241d9788a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d529d6c9f7e3aaeac13c4948f79799ccb825f29d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.14 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.258 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.142 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.92 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64047","cve":"CVE-2026-64047","epss":"0.001760000","percentile":"0.073880000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/tls/tls_sw.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"73963a375885d5ccb7def39fd0b4f542e0f343dd","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"47110c3a9ac247b688657337f5981efcfcb240dc","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"84158c2997159df4a0d70cd9c46774512d32a522","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"131ef12057d92b77b636321b7849c69222405a97","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"66339b71f105e6f83e0da3b9583d95077534fe1d","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"eca989eab4b2599dcb02f72140a7c08f08838520","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"2fb0dc7e0099686c4e9d2732745d8a31b18c3628","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"lessThan":"285943c6e7ca309bbea84b253745154241d9788a","status":"affected","version":"9aaaa56845a06aeabdd597cbe19492dc01f281ec","versionType":"git"},{"status":"affected","version":"d529d6c9f7e3aaeac13c4948f79799ccb825f29d","versionType":"git"},{"lessThan":"5.5","status":"affected","version":"5.4.14","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/tls/tls_sw.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.5"},{"lessThan":"5.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.142","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.142","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.92","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end < sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n  struct sk_msg_sg {\n        [...]\n        /* The extra two elements:\n         * 1) used for chaining the front and sections when the list becomes\n         *    partitioned (e.g. end < start). The crypto APIs require the\n         *    chaining;\n         * 2) to chain tailer SG entries after the message.\n         */\n        struct scatterlist              data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n    sg_chain(&msg_pl->sg.data[msg_pl->sg.start],\n             MAX_SKB_FRAGS - msg_pl->sg.start + 1,\n             msg_pl->sg.data);\n\nThis places the chain pointer at\n\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n  &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n  data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n  data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina)."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:42:47.774Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd"},{"url":"https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc"},{"url":"https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522"},{"url":"https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97"},{"url":"https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d"},{"url":"https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520"},{"url":"https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628"},{"url":"https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a"}],"title":"net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64047","datePublished":"2026-07-19T15:39:31.960Z","dateReserved":"2026-07-19T07:54:57.029Z","dateUpdated":"2026-07-20T13:42:47.774Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:45","lastModifiedDate":"2026-07-20 15:17:05","problem_types":[],"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:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64047","Ordinal":"1","Title":"net: tls: fix off-by-one in sg_chain entry count for wrapped sk_","CVE":"CVE-2026-64047","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64047","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end < sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n  struct sk_msg_sg {\n        [...]\n        /* The extra two elements:\n         * 1) used for chaining the front and sections when the list becomes\n         *    partitioned (e.g. end < start). The crypto APIs require the\n         *    chaining;\n         * 2) to chain tailer SG entries after the message.\n         */\n        struct scatterlist              data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n    sg_chain(&msg_pl->sg.data[msg_pl->sg.start],\n             MAX_SKB_FRAGS - msg_pl->sg.start + 1,\n             msg_pl->sg.data);\n\nThis places the chain pointer at\n\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n  &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n  data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n  data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina).","Type":"Description","Title":"net: tls: fix off-by-one in sg_chain entry count for wrapped sk_"}]}}}