{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2.9-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  perf/core: Fix a refcount leak in attach_perf_ctx_data()  The attach_perf_ctx_data() can race on global and !global cases.  The global case is protected by global_ctx_data_rwsem and shares a single reference count using perf_ctx_data.global field.  But when it races with !global case, it may miss to set the global field and result in a reference count leak.   CPU1                                  CPU2  ----------------------------------------------------------------  attach_task_ctx_data(.global=1)       attach_task_ctx_data(.global=0)    cd1 = alloc_perf_ctx_data();          cd2 = alloc_perf_ctx_data();                                          //    { .global = 0, .refcount = 1 };                                           try_cmpxchg(); // success,                                          // task-\u003eperf_ctx_data = cd2    try_cmpxhg(); // fail; old = cd2    refcount_inc_not_zero(\u0026old-\u003erefcount); // success      // old.refcount = 2    free_perf_ctx_data(cd1);  Then later detach_global_ctx_data() will see the data but it's not marked as global, so it won't call detach_task_ctx_data().",
  "id": "DEBIAN-CVE-2026-98552",
  "modified": "2026-10-19T04:47:44.912259411Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-98552"
    }
  ],
  "upstream": [
    "CVE-2026-98552"
  ]
}