CVE-2026-98062 (GCVE-0-2026-98062)
Vulnerability from cvelistv5
Published
2026-09-25 10:24
Modified
2026-10-21 12:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Mark signal tracepoint siginfo arguments as scalar The signal_generate and signal_deliver tracepoints declare their info argument as a struct kernel_siginfo pointer. btf_ctx_access() therefore treats it as a trusted pointer for tp_btf programs. Signal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special values for this argument. Those values are zero and one respectively, and are not pointers. A tp_btf program can currently dereference either value and fault the kernel. In particular, signal_generate can run from timer interrupt context, turning the fault into a kernel panic. Record both tracepoints in raw_tp_null_args[] and mark argument one as a non-pointer. This preserves scalar access to the cookie while rejecting direct and helper-mediated pointer use. Merely marking it nullable would not suffice because SEND_SIG_PRIV is nonzero.
References
Impacted products
Vendor Product Version
Linux Linux Version: b2fc4b17fc13810ef440fb323fad3981cd174985
Version: 838a10bd2ebfe11a60dd67687533a7cfc220cc86
Version: 838a10bd2ebfe11a60dd67687533a7cfc220cc86
Version: 838a10bd2ebfe11a60dd67687533a7cfc220cc86
Version: 6.12.6   ≤
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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "kernel/bpf/btf.c"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark signal tracepoint siginfo arguments as scalar\n\nThe signal_generate and signal_deliver tracepoints declare their info\nargument as a struct kernel_siginfo pointer. btf_ctx_access() therefore\ntreats it as a trusted pointer for tp_btf programs.\n\nSignal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special\nvalues for this argument. Those values are zero and one respectively,\nand are not pointers. A tp_btf program can currently dereference either\nvalue and fault the kernel. In particular, signal_generate can run from\ntimer interrupt context, turning the fault into a kernel panic.\n\nRecord both tracepoints in raw_tp_null_args[] and mark argument one as\na non-pointer. This preserves scalar access to the cookie while rejecting\ndirect and helper-mediated pointer use. Merely marking it nullable would\nnot suffice because SEND_SIG_PRIV is nonzero."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:54:20.506Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/05757377fa0447163d07c43a119f81abe1eef8dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351"
        },
        {
          "url": "https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70"
        }
      ],
      "title": "bpf: Mark signal tracepoint siginfo arguments as scalar",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98062",
    "datePublished": "2026-09-25T10:24:06.597Z",
    "dateReserved": "2026-09-25T10:19:56.073Z",
    "dateUpdated": "2026-10-21T12:54:20.506Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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