CVE-2026-23217None▾ SunlitIn 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 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.09%
0.09% → 0.1%
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.
Linux >= 1ff95eb2bebda50c4c5406caaf201e0fcb24cc8f < f8b8ec0ddde74066d4452a7a961da544f193e00fLinux >= 1ff95eb2bebda50c4c5406caaf201e0fcb24cc8f < b1f8285bc8e3508c1fde23b5205f1270215d4984Linux >= 1ff95eb2bebda50c4c5406caaf201e0fcb24cc8f < b0d7f5f0c9f05f1b6d4ee7110f15bef9c11f9df0Linux 82f134ddd4f5da11c277bd1aa02e2a733179725aLinux >= 6.10.10 < 6.11Linux 6.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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