{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53223",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53223"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "net: guard timestamp cmsgs to real error queue skbs",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: guard timestamp cmsgs to real error queue skbs\n\nskb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb\nfrom sk_error_queue. That assumption is not true for AF_PACKET sockets:\noutgoing packet taps are also delivered to packet sockets with\nskb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET\ninstead of struct sock_exterr_skb.\n\nIf such an skb is received with timestamping enabled, the generic\ntimestamp cmsg path can read AF_PACKET control-buffer state as\nsock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop\ncounter overlaps opt_stats. An odd drop count makes the path emit\nSCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear\nskbs this copies past the linear head and can trigger hardened usercopy or\ndisclose adjacent heap contents.\n\nKeep skb_is_err_queue() local to net/socket.c, but make it verify that\nthe PACKET_OUTGOING marker is paired with the sock_rmem_free destructor\ninstalled by sock_queue_err_skb(). AF_PACKET receive skbs use normal\nreceive ownership and no longer pass as error-queue skbs, while legitimate\nsk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free\nownership.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through local socket syscalls on an AF_PACKET socket, including setsockopt(), sending traffic that is tapped as PACKET_OUTGOING, and recvmsg(). Remote packets alone do not reach the bug without a local attacker-controlled packet socket.\nAC:L - The attacker controls the socket options, packet-socket receive queue pressure/drop count, and outgoing traffic needed to make the timestamp cmsg path run. No uncontrollable race or rare environmental condition is required for the highest-impact disclosure/crash scenario.\nPR:L - Creating AF_PACKET sockets requires CAP_NET_RAW in the governing user namespace. Because this capability can be obtained by an unprivileged local user in user/network namespaces on common deployments, this is Low rather than High.\nUI:N - No victim action is required after the attacker has local execution; the attacker can configure the socket and trigger recvmsg() themselves. The bug is not dependent on opening a file, mounting media, or other user-assisted behavior.\nS:U - The impact remains within the kernel and the local host security authority. It does not cross a hypervisor, VM, IOMMU, or other separate security scope boundary.\nC:H - The bogus SCM_TIMESTAMPING_OPT_STATS cmsg can copy skb->len bytes from skb->data even when the skb is non-linear, reading past the linear head. That can disclose adjacent kernel heap contents to userspace, which is a high confidentiality impact.\nI:N - The investigated bug is an out-of-bounds read/copy-to-user and misclassification of skb metadata, not a kernel write primitive. I found no direct modification of kernel memory or protected data.\nA:H - The same invalid copy can trigger hardened usercopy failures or kernel oops/panic on hardened deployments. The local attacker can repeat the trigger, so availability impact is High."
    }
  }
}