FKIE_CVE-2026-98062

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/btf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0e78cb242a57e481061fcb542fed4d51afba25c4",
              "status": "affected",
              "version": "838a10bd2ebfe11a60dd67687533a7cfc220cc86",
              "versionType": "git"
            },
            {
              "lessThan": "d2eaea3599bcce659ce91862254dc91bcbdb6351",
              "status": "affected",
              "version": "838a10bd2ebfe11a60dd67687533a7cfc220cc86",
              "versionType": "git"
            },
            {
              "lessThan": "77515ab12e4983e6416f8c35039a3f0c0822ac70",
              "status": "affected",
              "version": "838a10bd2ebfe11a60dd67687533a7cfc220cc86",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b2fc4b17fc13810ef440fb323fad3981cd174985",
              "versionType": "git"
            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/btf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-98062",
  "lastModified": "2026-09-25T11:17:35.220",
  "metrics": {},
  "published": "2026-09-25T11:17:35.220",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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