CVE-2026-80857

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.

Package Linux Kernel
Published 2026-09-04
Last modified 2026-10-19
Patch available
Yes

Affected versions

Linux kernel versions 6.18.25, 7.0.2, 7.1 and later are affected. Fixed in 6.18.50, 7.2.3, 7.3 and their respective stable series.

Affected from
≥ 6.18.25 ≥ 7.0.2 ≥ 7.1
Fixed in
✓ 6.18.50 6.18.x ✓ 7.2.3 7.2.x ✓ 7.3

References

3 total

Frequently asked questions

  • What is CVE-2026-80857?

    CVE-2026-80857 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.18.25 onward and has been patched in 6.18.50, 7.2.3 and 7.3. CVE-2026-80857 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • Is there a patch available for CVE-2026-80857?

    Yes. CVE-2026-80857 has been patched. Fixed versions include 6.18.50, 7.2.3 and 7.3. If you are running Linux kernel 6.18.25 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-80857 actively exploited?

    No. CVE-2026-80857 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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