# CVE-2026-23217: riscv: trace: fix snapshot deadlock with sbi ecall

CVE-2026-23217 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-23217, released February 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-23217
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23217

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-23217](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23217.md) | Feb 18, 2026 |
| Linux | linux Debian 14 | 6.18.10-1 | [DEBIAN-CVE-2026-23217](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23217.md) | Feb 18, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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