{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.94-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.13-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix NULL-deref of opinfo-\u003econn in oplock/lease break notifiers  smb2_oplock_break_noti() and smb2_lease_break_noti() read opinfo-\u003econn into a local with neither READ_ONCE() nor a NULL check.  Both run from oplock_break() after opinfo_get_list() has dropped ci-\u003em_lock, so a concurrent SMB2 LOGOFF (session_fd_check()) can set op-\u003econn = NULL under ci-\u003em_lock within that window.  ksmbd_conn_r_count_inc(conn) then writes through NULL at offset 0xc4 -- a remotely triggerable oops.  Guard both reads the way compare_guid_key() already does: read opinfo-\u003econn with READ_ONCE() and return early if it is NULL, before allocating the work struct so nothing leaks.  A NULL conn means the client is gone and the break is moot, so return 0; oplock_break() treats that as success and runs the normal teardown.",
  "id": "DEBIAN-CVE-2026-53271",
  "modified": "2026-09-14T16:47:41.232699904Z",
  "published": "2026-06-25T09:16:45.247Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-53271"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-53271"
  ]
}