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CVE-2026-72385 (GCVE-0-2026-72385)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:13
VLAI
Title
tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry() fprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of the per-ip fprobe list and fills it in a second walk, both under rcu_read_lock() only. A fprobe registered on an already-live ip can become visible between the two walks, so the fill walk processes an exit_handler the sizing walk did not count and used runs past reserved_words. If the sizing walk counted nothing, fgraph_data is NULL and the first write_fprobe_header() faults: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167 Call Trace: <TASK> function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677 ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671 __kernel_text_address+0x9/0x40 kernel/extable.c:78 arch_stack_walk+0x117/0x170 arch/x86/kernel/stacktrace.c:26 kmem_cache_free+0x188/0x580 mm/slub.c:6378 tcp_data_queue+0x18d/0x6550 net/ipv4/tcp_input.c:5590 [...] </TASK> The list cannot be frozen across the two walks, so skip a node that does not fit the reservation and count it as missed.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4346ba1604093305a287e08eb465a9c15ba05b80 , < 62988204162fc382cfc7d9a185d40a751261e3a3 (git)
Affected: 4346ba1604093305a287e08eb465a9c15ba05b80 , < d655cca1c6e67eb081214d37eb231a869ead2f97 (git)
Affected: 4346ba1604093305a287e08eb465a9c15ba05b80 , < 367c49d6e283c17b56a31e7a8d964a079244264c (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "kernel/trace/fprobe.c"
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()\n\nfprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of\nthe per-ip fprobe list and fills it in a second walk, both under\nrcu_read_lock() only. A fprobe registered on an already-live ip can\nbecome visible between the two walks, so the fill walk processes an\nexit_handler the sizing walk did not count and used runs past\nreserved_words. If the sizing walk counted nothing, fgraph_data is NULL\nand the first write_fprobe_header() faults:\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167\n  Call Trace:\n   \u003cTASK\u003e\n   function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677\n   ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671\n   __kernel_text_address+0x9/0x40 kernel/extable.c:78\n   arch_stack_walk+0x117/0x170 arch/x86/kernel/stacktrace.c:26\n   kmem_cache_free+0x188/0x580 mm/slub.c:6378\n   tcp_data_queue+0x18d/0x6550 net/ipv4/tcp_input.c:5590\n   [...]\n   \u003c/TASK\u003e\n\nThe list cannot be frozen across the two walks, so skip a node that does\nnot fit the reservation and count it as missed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:13:38.517Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/62988204162fc382cfc7d9a185d40a751261e3a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d655cca1c6e67eb081214d37eb231a869ead2f97"
        },
        {
          "url": "https://git.kernel.org/stable/c/367c49d6e283c17b56a31e7a8d964a079244264c"
        }
      ],
      "title": "tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()",
      "x_generator": {
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      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72385",
    "datePublished": "2026-08-15T05:56:16.050Z",
    "dateReserved": "2026-08-09T03:40:39.923Z",
    "dateUpdated": "2026-08-17T05:13:38.517Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72385",
      "date": "2026-09-05",
      "epss": "0.00198",
      "percentile": "0.09615"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T11:08:41+00:00",
      "cve": "CVE-2026-72385",
      "id": "CVE-2026-72385",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72385.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.