CVE-2026-23217
Full vulnerability record from the local CVENow database.
Description
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. 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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-02-18 15:18:43.080000
Last modified
2026-10-21 13:18:34.760000
View original CVE JSON
{
"id": "CVE-2026-23217",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-02-18T15:18:43.080",
"lastModified": "2026-10-21T13:18:34.760",
"vulnStatus": "Modified",
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{
"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."
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"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
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"source": "[email protected]",
"type": "Primary",
"description": [
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"lang": "en",
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