Deadlock Issue in RISC-V Systems Related to Linux Kernel Functions
CVE-2026-23217
What is CVE-2026-23217?
A deadlock vulnerability exists in the Linux kernel specifically affecting RISC-V systems due to improper handling of function tracing for sbi_ecall functions. When these functions are traceable, invoking the __sbi_ecall function can lead to an endless loop of snapshot requests to the ringbuffer, resulting in a complete system stall. This can be easily triggered with periodic sbi ecalls issued by the timer subsystem on specific RISC-V configurations. To mitigate this issue, it is essential to exclude sbi_ecall.c functions from tracing fully, which poses minimal limitations for logging necessary events.

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Affected Version(s)
Linux 1ff95eb2bebda50c4c5406caaf201e0fcb24cc8f
Linux 1ff95eb2bebda50c4c5406caaf201e0fcb24cc8f
Linux 82f134ddd4f5da11c277bd1aa02e2a733179725a