{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93817",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93817"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "perf: Fix addr_filter_ranges lifetime",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix addr_filter_ranges lifetime\n\nLee Jia Jie reported that since event::addr_filter_ranges is used\nunder RCU, it should be RCU freed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93817"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f1853b2b9f38f1343790bae8c0601b3f7554754"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e62d4192e593630f355094adc467058a05bdc935"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-25T12:45:48Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The buggy kfree of event->addr_filter_ranges is in __free_event(), reached from close(2) via perf_release() \u2192 perf_event_release_kernel() \u2192 put_event() \u2192 _free_event(). The concurrent use is a local mmap(2)/exec that hits perf_event_mmap()/perf_event_exec() \u2192 perf_iterate_ctx(). No remote protocol supplies the triggering state.\nAC:L - The attacker sets attr.inherit, opens an intel_pt/cs_etm event, issues PERF_EVENT_IOC_SET_FILTER, then forks/clones. close() on the parent fd kfree's the child's addr_filter_ranges in __free_event() while the child mmap()s a VM_EXEC mapping so __perf_addr_filters_adjust() writes the freed array. Both sides are attacker-driven.\nPR:L - Default perf_event_paranoid=2 still allows an unprivileged per-task intel_pt or cs_etm event with exclude_kernel set; pt_event_init() and etm_event_init() have no capable() check, and find_get_context() calls perf_allow_cpu() only for pid==-1. PERF_EVENT_IOC_SET_FILTER is then ioctl'd on that fd via perf_ioctl().\nUI:N - The attacker performs sys_perf_event_open(), PERF_EVENT_IOC_SET_FILTER, fork/clone, mmap() of the filtered file, and close() entirely in tasks they control. No separate victim must mount a filesystem or open a file.\nS:U - The defect is a host-kernel heap UAF of event->addr_filter_ranges in kernel/events/core.c. Impact stays inside the kernel's own security authority and is not a KVM/Xen guest-to-host escape or IOMMU/DMA bypass.\nC:H - __free_event() kfree's the kcalloc'd addr_filter_ranges array while RCU walkers still hold the event. Reclaiming that heap object, combined with pt_event_addr_filters_sync()/etm_addr_filters_sync() reading fr[range].start/size, yields a kernel read primitive.\nI:H - __perf_addr_filters_adjust() and perf_event_addr_filters_exec() write attacker-influenced vma start/size into the already-freed addr_filter_ranges slots. That heap UAF write is sprayable into a control-flow hijack / arbitrary write.\nA:H - Use-after-free of addr_filter_ranges while perf_iterate_ctx() still observes the event on ctx->event_list causes a kernel oops or panic when the freed slots are indexed or the reallocated object is corrupted."
    }
  }
}