{
  "cveId": "CVE-2021-47261",
  "url": "https://patchblox.com/security/cve/CVE-2021-47261",
  "summary": "CVE-2021-47261 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47261, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  IB/mlx5: Fix initializing CQ fragments buffer  T...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  IB/mlx5: Fix initializing CQ fragments buffer  The function init_cq_frag_buf() can be called to initialize the current CQ fragments buffer cq-\u003Ebuf, or the temporary cq-\u003Eresize_buf that is filled during CQ resize operation.  However, the offending commit started to use function get_cqe() for getting the CQEs, the issue with this change is that get_cqe() always returns CQEs from cq-\u003Ebuf, which leads us to initialize the wrong buffer, and in case of enlarging the CQ we try to access elements beyond the size of the current cq-\u003Ebuf and eventually hit a kernel panic.   [exception RIP: init_cq_frag_buf\u002B103]   [ffff9f799ddcbcd8] mlx5_ib_resize_cq at ffffffffc0835d60 [mlx5_ib]   [ffff9f799ddcbdb0] ib_resize_cq at ffffffffc05270df [ib_core]   [ffff9f799ddcbdc0] llt_rdma_setup_qp at ffffffffc0a6a712 [llt]   [ffff9f799ddcbe10] llt_rdma_cc_event_action at ffffffffc0a6b411 [llt]   [ffff9f799ddcbe98] llt_rdma_client_conn_thread at ffffffffc0a6bb75 [llt]   [ffff9f799ddcbec8] kthread at ffffffffa66c5da1   [ffff9f799ddcbf50] ret_from_fork_nospec_begin at ffffffffa6d95ddd  Fix it by getting the needed CQE by calling mlx5_frag_buf_get_wqe() that takes the correct source buffer as a parameter.",
  "published": "2024-05-21T15:15:14Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00236,
  "epssPercentile": 0.14663,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47261",
      "released": "2024-05-21T15:15:14Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47261",
      "released": "2024-05-21T15:15:14Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47261",
      "released": "2024-05-21T15:15:14Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}