{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31774",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31774"
  ],
  "published": "2026-05-01T14:17:31Z",
  "summary": "io_uring/net: fix slab-out-of-bounds read in io_bundle_nbufs()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: fix slab-out-of-bounds read in io_bundle_nbufs()\n\nsqe->len is __u32 but gets stored into sr->len which is int. When\nuserspace passes sqe->len values exceeding INT_MAX (e.g. 0xFFFFFFFF),\nsr->len overflows to a negative value. This negative value propagates\nthrough the bundle recv/send path:\n\n  1. io_recv(): sel.val = sr->len (ssize_t gets -1)\n  2. io_recv_buf_select(): arg.max_len = sel->val (size_t gets\n     0xFFFFFFFFFFFFFFFF)\n  3. io_ring_buffers_peek(): buf->len is not clamped because max_len\n     is astronomically large\n  4. iov[].iov_len = 0xFFFFFFFF flows into io_bundle_nbufs()\n  5. io_bundle_nbufs(): min_t(int, 0xFFFFFFFF, ret) yields -1,\n     causing ret to increase instead of decrease, creating an\n     infinite loop that reads past the allocated iov[] array\n\nThis results in a slab-out-of-bounds read in io_bundle_nbufs() from\nthe kmalloc-64 slab, as nbufs increments past the allocated iovec\nentries.\n\n  BUG: KASAN: slab-out-of-bounds in io_bundle_nbufs+0x128/0x160\n  Read of size 8 at addr ffff888100ae05c8 by task exp/145\n  Call Trace:\n   io_bundle_nbufs+0x128/0x160\n   io_recv_finish+0x117/0xe20\n   io_recv+0x2db/0x1160\n\nFix this by rejecting negative sr->len values early in both\nio_sendmsg_prep() and io_recvmsg_prep(). Since sqe->len is __u32,\nany value > INT_MAX indicates overflow and is not a valid length.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31774"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90ced24c500ad4e129e9e34b7e56fd7849e350b6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c314b405dcc4d8b9041124f928f81715d6328bec"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b655cd311344117d3052f6552cb20d9901c9d7c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b948f9d5d3057b01188e36664e7c7604d1c8ecb5"
    }
  ],
  "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 io_uring syscalls by submitting IORING_OP_RECV/SEND with provided buffer selection and bundle flags.\nAC:L - An attacker controls the SQE length, buffer ring contents, and socket traffic needed to trigger the slab out-of-bounds read; no race or external condition is required.\nPR:L - A basic unprivileged local user can normally create an io_uring instance and use ordinary sockets and provided buffer rings, absent non-default sysctl/LSM restrictions.\nUI:N - No victim action is needed after the attacker has local execution; the attacker submits the crafted io_uring operations directly.\nS:U - The impact remains within the local kernel/host security authority and does not cross a VM, IOMMU, or separate security-scope boundary.\nC:H - The bug causes an unbounded slab out-of-bounds read of iovec entries from kernel heap memory, and it is not strictly limited to a small fixed disclosure surface.\nI:N - The immediate primitive is an out-of-bounds read used for buffer accounting, with no demonstrated arbitrary kernel write or control-flow modification.\nA:H - The out-of-bounds read can trigger a KASAN/oops crash or an unbounded loop/page fault in kernel context, causing high availability impact."
    }
  }
}