CVE-2026-80860 fuse: fix race between interrupt and resend
A race condition in the Linux kernel FUSE subsystem can trigger a kernel warning and potential denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80860?
CVE-2026-80860 is a vulnerability in Linux, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
fuse: fix race between interrupt and resend
After commit f8fce75fedf7 ("fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req") the WARN_ON(!list_empty(&req->intr_entry)) in fuse_request_free() still triggers due to the following race:
In request_wait_answer() if (test_bit(FR_SENT, &req->flags)) -> returns true
In fuse_chan_resend() clear_bit(FR_SENT, &req->flags)
In request_wait_answer() queue_interrupt(req)
Fix by:
- move clearing FR_SENT inside fpq->lock
- move setting FR_PENDING inside fiq->lock
- recheck FR_SENT after acquiring fiq->lock in fuse_dev_queue_interrupt()
Which versions are affected by CVE-2026-80860?
How do I fix CVE-2026-80860?
Apply the vendor's patch.
Is CVE-2026-80860 being exploited?
There is no known exploitation of CVE-2026-80860 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80860, DEBIAN-CVE-2026-80860, GHSA-8279-rm4w-j7mp, UBUNTU-CVE-2026-80860.