CVE-2026-98007 (GCVE-0-2026-98007)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject non-scalar bpf_loop iteration counts bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged programs may pass pointer values to such arguments, so check_func_arg() lets a pointer-valued R1 reach the helper-specific checks. Since commit bb124da69c47 ("bpf: keep track of max number of bpf_loop callback iterations"), the verifier marks R1 precise and reads its upper bound to limit callback simulation. Precision backtracking only accepts scalar registers, so passing a pointer instead triggers the "backtracking misuse" verifier warning. Kernels with panic_on_warn enabled subsequently panic. Introduce ARG_SCALAR for helper arguments that only accept scalar values and use it for bpf_loop() nr_loops. Generic helper argument validation then rejects pointers before loop inlining and precision processing.
References
Impacted products
Vendor Product Version
Linux Linux Version: bfc5c19b4b48840627af0d0f1c8f4461b276e508
Version: bb124da69c47dd98d69361ec13244ece50bec63e
Version: bb124da69c47dd98d69361ec13244ece50bec63e
Version: bb124da69c47dd98d69361ec13244ece50bec63e
Version: bb124da69c47dd98d69361ec13244ece50bec63e
Version: 6.6.15   ≤
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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "include/linux/bpf.h",
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject non-scalar bpf_loop iteration counts\n\nbpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged\nprograms may pass pointer values to such arguments, so check_func_arg()\nlets a pointer-valued R1 reach the helper-specific checks.\n\nSince commit bb124da69c47 (\"bpf: keep track of max number of bpf_loop\ncallback iterations\"), the verifier marks R1 precise and reads its upper\nbound to limit callback simulation. Precision backtracking only accepts\nscalar registers, so passing a pointer instead triggers the \"backtracking\nmisuse\" verifier warning. Kernels with panic_on_warn enabled subsequently\npanic.\n\nIntroduce ARG_SCALAR for helper arguments that only accept scalar values\nand use it for bpf_loop() nr_loops. Generic helper argument validation then\nrejects pointers before loop inlining and precision processing."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:12.779Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2ff38b3552af53238aee6c877ae64cc798d46fce"
        },
        {
          "url": "https://git.kernel.org/stable/c/656d40d1ca228ee21a9b3280432479fc9eae75ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2e1161e03fecff6d2229a81b024337144bfcd97"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8ae8275c721334ee50fafdd986fb83294eb941a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3fd8e5fd100f122bad503bdc0e9277219533253"
        }
      ],
      "title": "bpf: Reject non-scalar bpf_loop iteration counts",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98007",
    "datePublished": "2026-09-25T10:23:32.939Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
    "dateUpdated": "2026-10-19T09:12:12.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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