{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72012",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72012"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "tracing/osnoise: Call synchronize_rcu() when unregistering",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/osnoise: Call synchronize_rcu() when unregistering\n\nThis ensures that any RCU readers traversing the instance list\nhave finished, before releasing the reference on the tracer that\nthe instance points to.",
  "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-2026-72012"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/428cedade9b2cc8e48f00742df0cfd770e77a803"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3c693635bb7b3a9b6645831a84fed2af46cdf249"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38366140dc8ee3568c7f0191d517e117963bd580"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fad36954b29592ce463254179c3043697678481f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dd0160a0842337f12e7694d68b184050afc6d3a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires writing tracefs (e.g. enabling osnoise/timerlat via current_tracer and deleting a tracing instance); there is no network, adjacent, or physical entry path to osnoise_unregister_instance().\nAC:L - An attacker who can configure tracing controls both teardown and sampling; deleting a trace instance while osnoise/timerlat is active races RCU readers that still dereference inst->tr, and this race is reliably attacker-driven.\nPR:L - Triggering requires tracefs write access to configure/destroy tracing instances; this is not init-namespace root on every system (tracing group/remounted tracefs or CAP_SYS_ADMIN in a container with tracefs mounted suffices).\nUI:N - No victim interaction is required; exploitation is achieved entirely by the attacker's tracing configuration and concurrent instance teardown.\nS:U - The use-after-free corrupts kernel memory within the same kernel security domain; it does not cross VM, IOMMU, or sandbox boundaries by itself.\nC:H - Deferred kvfree_rcu_mightsleep() lets __remove_instance() free the trace_array while RCU readers in IRQ/NMI/timerlat paths still dereference inst->tr, a classic UAF enabling arbitrary kernel memory disclosure.\nI:H - The dangling trace_array pointer can be leveraged for heap corruption and control-flow hijack; UAF of kernel heap objects is scored as high integrity impact even when the immediate failure mode is a crash.\nA:H - Concurrent access to a freed trace_array causes kernel oops/panic from RCU list walkers and buffer operations; UAF in interrupt context can crash or hang the system even without full exploitation."
    }
  }
}