{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-52656",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2023-52656"
  ],
  "published": "2024-05-13T13:12:48Z",
  "summary": "io_uring: drop any code related to SCM_RIGHTS",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: drop any code related to SCM_RIGHTS\n\nThis is dead code after we dropped support for passing io_uring fds\nover SCM_RIGHTS, get rid of it.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
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        "name": "linux"
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-52656"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cfb24022bb2c31f1f555dc6bc3cc5e2547446fb3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a6771f343af90a25f3a14911634562bb5621df02"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d909d381c3152393421403be4b6435f17a2378b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3812a47a32022ca76bf46ddacdd823dc2aabf8b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6fc19b3d8a45ff0e5d50ec8184cee1d5eac1a8ba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/88c49d9c896143cdc0f77197c4dcf24140375e89"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e5e6d274956305f1fc0340522b38f5f5be74bdb"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable SCM accounting path is reached via local io_uring syscalls (io_uring_setup and io_uring_register with IORING_REGISTER_FILES), not via network packet processing.\nAC:L - An unprivileged attacker fully controls both sides of the unix GC / unix_stream_read_generic race by creating the ring, registering unix sockets as fixed files, and driving concurrent SCM/socket operations, so success does not depend on external conditions.\nPR:L - io_uring is available to unprivileged local users by default (sysctl io_uring_disabled=0); registering files and creating AF_UNIX sockets requires only a normal user account.\nUI:N - Exploitation requires no victim action; the attacker triggers the bug entirely through their own syscalls.\nS:U - Impact remains within the local kernel's security authority (standard local privilege escalation), with no VM/IOMMU/sandbox boundary crossed.\nC:H - The bug is a use-after-free in the io_uring/AF_UNIX SCM_RIGHTS GC interaction; UAF of socket/file objects enables arbitrary kernel memory read primitives.\nI:H - The same UAF is exploitable for heap reuse and arbitrary write / control-flow hijacking, matching the severity already assigned to sibling CVE-2023-52654 for this vulnerability class.\nA:H - Triggering the UAF/race reliably causes kernel oops, panic, or hang even when not fully exploited for code execution."
    }
  }
}