{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/net: fix slab-out-of-bounds read in io_bundle_nbufs()  sqe-\u003elen is __u32 but gets stored into sr-\u003elen which is int. When userspace passes sqe-\u003elen values exceeding INT_MAX (e.g. 0xFFFFFFFF), sr-\u003elen overflows to a negative value. This negative value propagates through the bundle recv/send path:    1. io_recv(): sel.val = sr-\u003elen (ssize_t gets -1)   2. io_recv_buf_select(): arg.max_len = sel-\u003eval (size_t gets      0xFFFFFFFFFFFFFFFF)   3. io_ring_buffers_peek(): buf-\u003elen is not clamped because max_len      is astronomically large   4. iov[].iov_len = 0xFFFFFFFF flows into io_bundle_nbufs()   5. io_bundle_nbufs(): min_t(int, 0xFFFFFFFF, ret) yields -1,      causing ret to increase instead of decrease, creating an      infinite loop that reads past the allocated iov[] array  This results in a slab-out-of-bounds read in io_bundle_nbufs() from the kmalloc-64 slab, as nbufs increments past the allocated iovec entries.    BUG: KASAN: slab-out-of-bounds in io_bundle_nbufs+0x128/0x160   Read of size 8 at addr ffff888100ae05c8 by task exp/145   Call Trace:    io_bundle_nbufs+0x128/0x160    io_recv_finish+0x117/0xe20    io_recv+0x2db/0x1160  Fix this by rejecting negative sr-\u003elen values early in both io_sendmsg_prep() and io_recvmsg_prep(). Since sqe-\u003elen is __u32, any value \u003e INT_MAX indicates overflow and is not a valid length.",
  "id": "DEBIAN-CVE-2026-31774",
  "modified": "2026-09-14T16:47:42.915823934Z",
  "published": "2026-05-01T15:16:40.720Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-31774"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-31774"
  ]
}