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CVE-2026-23217

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

riscv: trace: fix snapshot deadlock with sbi ecall

If sbi_ecall.c's functions are traceable,

echo "__sbi_ecall:snapshot" > /sys/kernel/tracing/set_ftrace_filter

may get the kernel into a deadlock.

(Functions in sbi_ecall.c are excluded from tracing if CONFIG_RISCV_ALTERNATIVE_EARLY is set.)

__sbi_ecall triggers a snapshot of the ringbuffer. The snapshot code raises an IPI interrupt, which results in another call to __sbi_ecall and another snapshot...

All it takes to get into this endless loop is one initial __sbi_ecall. On RISC-V systems without SSTC extension, the clock events in timer-riscv.c issue periodic sbi ecalls, making the problem easy to trigger.

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Always exclude the sbi_ecall.c functions from tracing to fix the potential deadlock.

sbi ecalls can easiliy be logged via trace events, excluding ecall functions from function tracing is not a big limitation.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23217",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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            {
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          "programFiles": [
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          "defaultStatus": "unaffected"
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              "version": "6.19",
              "versionType": "original_commit_for_fix",
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          ],
          "programFiles": [
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          "defaultStatus": "affected"
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      ]
    }
  ],
  "published": "2026-02-18T15:18:43.080",
  "references": [
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      "tags": [
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    },
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      "url": "https://git.kernel.org/stable/c/b1f8285bc8e3508c1fde23b5205f1270215d4984",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: trace: fix snapshot deadlock with sbi ecall\n\nIf sbi_ecall.c's functions are traceable,\n\necho \"__sbi_ecall:snapshot\" > /sys/kernel/tracing/set_ftrace_filter\n\nmay get the kernel into a deadlock.\n\n(Functions in sbi_ecall.c are excluded from tracing if\nCONFIG_RISCV_ALTERNATIVE_EARLY is set.)\n\n__sbi_ecall triggers a snapshot of the ringbuffer. The snapshot code\nraises an IPI interrupt, which results in another call to __sbi_ecall\nand another snapshot...\n\nAll it takes to get into this endless loop is one initial __sbi_ecall.\nOn RISC-V systems without SSTC extension, the clock events in\ntimer-riscv.c issue periodic sbi ecalls, making the problem easy to\ntrigger.\n\nAlways exclude the sbi_ecall.c functions from tracing to fix the\npotential deadlock.\n\nsbi ecalls can easiliy be logged via trace events, excluding ecall\nfunctions from function tracing is not a big limitation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nriscv: trace: corregir interbloqueo de instantánea con sbi ecall\n\nSi las funciones de sbi_ecall.c son rastreables,\n\necho '__sbi_ecall:snapshot' > /sys/kernel/tracing/set_ftrace_filter\n\npuede llevar al kernel a un interbloqueo.\n\n(Las funciones en sbi_ecall.c se excluyen del rastreo si CONFIG_RISCV_ALTERNATIVE_EARLY está configurado.)\n\n__sbi_ecall activa una instantánea del ringbuffer. El código de la instantánea genera una interrupción IPI, lo que resulta en otra llamada a __sbi_ecall y otra instantánea...\n\nTodo lo que se necesita para entrar en este bucle infinito es una __sbi_ecall inicial. En sistemas RISC-V sin la extensión SSTC, los eventos de reloj en timer-riscv.c emiten sbi ecalls periódicas, haciendo que el problema sea fácil de activar.\n\nExcluir siempre las funciones de sbi_ecall.c del rastreo para corregir el interbloqueo potencial.\n\nLas sbi ecalls pueden registrarse fácilmente a través de eventos de rastreo, excluir las funciones ecall del rastreo de funciones no es una gran limitación."
    }
  ],
  "lastModified": "2026-06-17T10:21:07.253",
  "configurations": [
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      "nodes": [
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