{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53191",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53191"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "io_uring/net: inherit IORING_CQE_F_BUF_MORE across bundle recv retries",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: inherit IORING_CQE_F_BUF_MORE across bundle recv retries\n\nWhen a bundle recv retries inside io_recv_finish(), the merge logic OR\nthe saved cflags from the previous iteration with the cflags returned by\nthe new iteration:\n  cflags = req->cqe.flags | (cflags & CQE_F_MASK);\n\nBits listed in CQE_F_MASK are inherited from the new iteration, and all\nother bits (notably IORING_CQE_F_BUFFER and the buffer ID) come from the\nsaved cflags. Before this change CQE_F_MASK covered only\nIORING_CQE_F_SOCK_NONEMPTY and IORING_CQE_F_MORE.\n\nWhen using provided buffer rings (IOU_PBUF_RING_INC) with incremental\nmode, and bundle recv, io_kbuf_inc_commit() can leave the head ring\nentry partially consumed, __io_put_kbufs() then sets\nIORING_CQE_F_BUF_MORE on the returned cflags so userspace knows the\nbuffer ID will be reused for subsequent completions.\n\nBecause IORING_CQE_F_BUF_MORE was not in CQE_F_MASK, the merge above\nsilently dropped it whenever the final retry iteration partially\nconsumed the buffer, and the subsequent req->cqe.flags = cflags &\n~CQE_F_MASK save would have left a stale IORING_CQE_F_BUF_MORE in the\ncarried-over cflags had one been present. Userspace would then\nwrongfully advance it ring head past an entry the kernel still uses.\n\nAdd IORING_CQE_F_BUF_MORE to CQE_F_MASK so it is both inherited from the\nnew iteration into the user-visible CQE and stripped from the saved\ncflags between iterations.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53191"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f40570fda3f3a1f96aeaa4aef665ba274b2810b5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0bbc9481f970b0b4ddb08cfa464db1cc93b74b56"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4973232a67e4137ab9399f504f7f2bdd847f96d2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed46f39c47eb5530a9c161481a2080d3a869cfaf"
    }
  ],
  "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": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through locally submitted io_uring receive operations with buffer selection and bundle recv; a remote peer can influence socket data, but cannot select these io_uring flags or register the buffer ring by itself.\nAC:L - The trigger is deterministic once the attacker controls the io_uring setup, buffer sizes, and socket data pattern; no uncontrolled race or rare kernel state is required.\nPR:L - A basic unprivileged local user can normally create an io_uring instance, register an incremental provided-buffer ring, and submit IORING_OP_RECV, absent non-default sysctl or LSM restrictions.\nUI:N - No separate victim interaction is required after the attacker submits the crafted io_uring operations and supplies socket data.\nS:U - This is a kernel/io_uring buffer ownership bug and does not cross a VM, IOMMU, or other separate security authority boundary.\nC:H - The dropped BUF_MORE flag can make userspace reclaim a buffer that the kernel will continue to use, creating a use-after-recycle style memory corruption primitive in an affected io_uring consumer.\nI:H - The stale ownership state can cause later kernel receives to write attacker-controlled socket data into memory that the application has legitimately reused, which is a high-impact corruption primitive.\nA:H - The same buffer reuse corruption can crash or destabilize an affected io_uring receiver, and repeated triggering is under attacker control once the vulnerable operation pattern is in use."
    }
  }
}