CVE-2026-64047 (GCVE-0-2026-64047)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-10-19 20:28
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring When an sk_msg scatterlist ring wraps (sg.end < sg.start), tls_push_record() chains the tail portion of the ring to the head using sg_chain(). An extra entry in the sg array is reserved for this: struct sk_msg_sg { [...] /* The extra two elements: * 1) used for chaining the front and sections when the list becomes * partitioned (e.g. end < start). The crypto APIs require the * chaining; * 2) to chain tailer SG entries after the message. */ struct scatterlist data[MAX_MSG_FRAGS + 2]; The current code uses MAX_SKB_FRAGS + 1 as the ring size: sg_chain(&msg_pl->sg.data[msg_pl->sg.start], MAX_SKB_FRAGS - msg_pl->sg.start + 1, msg_pl->sg.data); This places the chain pointer at sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. = &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 = data[start + (MAX_SKB_FRAGS - start + 1) - 1] = data[MAX_SKB_FRAGS] instead of the true last entry. This is likely due to a "race" of the commit under Fixes landing close to commit 031097d9e079 ("bpf: sk_msg, zap ingress queue on psock down") Convert to ARRAY_SIZE and drop the data[start] / - start (as suggested by Sabrina).
References
Impacted products
Vendor Product Version
Linux Linux Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: 9aaaa56845a06aeabdd597cbe19492dc01f281ec
Version: d529d6c9f7e3aaeac13c4948f79799ccb825f29d
Version: 5.4.14   ≤
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    "dateUpdated": "2026-10-19T20:28:10.717Z",
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Scatterlist corruption in the kernel crypto TX path can cause kernel oopses, panics, or fatal BUG conditions when invalid chain entries or page pointers are dereferenced.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"73963a375885d5ccb7def39fd0b4f542e0f343dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"47110c3a9ac247b688657337f5981efcfcb240dc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"84158c2997159df4a0d70cd9c46774512d32a522\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"131ef12057d92b77b636321b7849c69222405a97\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"66339b71f105e6f83e0da3b9583d95077534fe1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"eca989eab4b2599dcb02f72140a7c08f08838520\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"2fb0dc7e0099686c4e9d2732745d8a31b18c3628\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9aaaa56845a06aeabdd597cbe19492dc01f281ec\", \"lessThan\": \"285943c6e7ca309bbea84b253745154241d9788a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d529d6c9f7e3aaeac13c4948f79799ccb825f29d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.4.14\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/tls/tls_sw.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.142\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.92\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/tls/tls_sw.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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 \u003c 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 \u003c 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(\u0026msg_pl-\u003esg.data[msg_pl-\u003esg.start],\\n             MAX_SKB_FRAGS - msg_pl-\u003esg.start + 1,\\n             msg_pl-\u003esg.data);\\n\\nThis places the chain pointer at\\n\\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\\n  \u0026data[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).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.142\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.92\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.34\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.11\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:38:39.300Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64047\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T15:42:20.839Z\", \"dateReserved\": \"2026-07-19T07:54:57.029Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T15:39:31.960Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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