CVE-2026-63830 (GCVE-0-2026-63830)
Vulnerability from cvelistv5
Published
2026-07-19 12:02
Modified
2026-10-19 20:07
Severity ?
9.4 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Summary
In the Linux kernel, the following vulnerability has been resolved: net: skmsg: preserve sg.copy across SG transforms The sk_msg sg.copy bitmap is part of the scatterlist entry ownership state. A set bit tells sk_msg_compute_data_pointers() not to expose the entry through writable BPF ctx->data. This protects entries backed by pages that are not private to the sk_msg, such as splice-backed file page-cache pages. Several sk_msg transform paths move, copy, split, or compact msg->sg.data[] entries without moving the matching sg.copy bit. This can make an externally backed entry arrive at a new slot with a clear copy bit. A later SK_MSG verdict can then expose sg_virt(sge) as writable ctx->data and BPF stores can modify the original page cache. Keep sg.copy synchronized with sg.data[] whenever entries are transferred, shifted, split, or copied into a new sk_msg. Clear the bit when an entry is replaced by a newly allocated private page or freed. This covers the BPF pull/push/pop helpers, sk_msg_shift_left/right(), sk_msg_xfer(), and tls_split_open_record(), including the partial tail entry created during TLS open-record splitting.
References
Impacted products
Vendor Product Version
Linux Linux Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
Version: d3b18ad31f93d0b6bae105c679018a1ba7daa9ca
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{\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: skmsg: preserve sg.copy across SG transforms\\n\\nThe sk_msg sg.copy bitmap is part of the scatterlist entry ownership\\nstate. A set bit tells sk_msg_compute_data_pointers() not to expose the\\nentry through writable BPF ctx-\u003edata. This protects entries backed by\\npages that are not private to the sk_msg, such as splice-backed file\\npage-cache pages.\\n\\nSeveral sk_msg transform paths move, copy, split, or compact\\nmsg-\u003esg.data[] entries without moving the matching sg.copy bit. This can\\nmake an externally backed entry arrive at a new slot with a clear copy\\nbit. A later SK_MSG verdict can then expose sg_virt(sge) as writable\\nctx-\u003edata and BPF stores can modify the original page cache.\\n\\nKeep sg.copy synchronized with sg.data[] whenever entries are\\ntransferred, shifted, split, or copied into a new sk_msg. Clear the bit\\nwhen an entry is replaced by a newly allocated private page or freed.\\nThis covers the BPF pull/push/pop helpers, sk_msg_shift_left/right(),\\nsk_msg_xfer(), and tls_split_open_record(), including the partial tail\\nentry created during TLS open-record splitting.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.177\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.144\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.95\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.38\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.3\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:51:39.075Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-63830\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:07:49.188Z\", \"dateReserved\": \"2026-07-19T07:54:57.014Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T12:02:23.741Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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