{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63830",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63830"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "net: skmsg: preserve sg.copy across SG transforms",
  "details": "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->data. 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->sg.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->data 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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/406e8a651a7b854c41fecd5117bb282b3a6c2c6b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.4,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is exercised on the kTLS/TCP send path when splice-backed page-cache pages in an sk_msg are processed by an SK_MSG BPF verdict on network sockets; a remote TLS peer can trigger this on internet-facing servers (HTTPS, service-mesh edge nodes) that serve file-backed responses via splice/sendfile.\nAC:L - The attacker controls the traffic patterns, message sizes, and splice-backed data needed to hit the desynchronized transform paths (bpf_msg_push/pop/pull, sk_msg shift/xfer, tls_split_open_record); no race against unrelated system state is required.\nPR:N - On production kTLS servers with an attached SK_MSG BPF program (common in Cilium/Cloudflare-class deployments), an unauthenticated remote peer can trigger the faulty transforms without any credentials on the victim; a fully local exploit via user-namespace CAP_NET_ADMIN is also possible but is not the highest-severity case.\nUI:N - Exploitation requires only network traffic to a vulnerable server (or local socket I/O); no victim user action such as opening a file or mounting a filesystem is needed beyond normal server operation.\nS:U - Impact remains within the kernel's security authority (page-cache corruption via the network/BPF stack); it does not cross a VM-hypervisor or IOMMU boundary even though corrupted cache pages may affect other processes.\nC:H - Exposing splice-backed page-cache pages as writable BPF ctx->data gives the attacker a kernel memory write primitive over shared file cache pages, which can be leveraged to read or infer sensitive file contents served from or mapped through the corrupted pages.\nI:H - The commit explicitly states BPF stores through the incorrectly writable ctx->data can modify the original page cache, constituting arbitrary integrity corruption of file-backed data beyond the socket buffer.\nA:L - While the primary impact is data corruption rather than a kernel oops, corrupting shared page-cache pages of files actively served to other clients can cause sustained service disruption and repeated application-level failures; when uncertain, availability impact above None is appropriate."
    }
  }
}