CVE-2026-80860: fuse: fix race between interrupt and resend

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-04 · updated 2026-10-19

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()

Affected products

Linux kernel: from 6.12.96 before 6.12.111; from 6.18.39 before 6.18.51; from 7.1.4 before 7.2; 7.2 — fixed in 6.12.111, 6.18.51, 7.2, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.12.111, 6.18.51, 7.2, 7.3. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-80860 or the next vulnerability affects your stack