Linux Kernel up to 7.2.2 FUSE fuse_request_free race condition

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.2 and classified as problematic. Affected is the function fuse_request_free of the component FUSE. Executing a manipulation can lead to race condition. This vulnerability is handled as CVE-2026-80860. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 7.2.2 and classified as problematic. This vulnerability affects the function fuse_request_free of the component FUSE. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect integrity, and availability. CVE summarizes:

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()

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-80860 since 08/26/2026. The exploitation appears to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 7.2.3 or 7.3-rc1 eliminates this vulnerability. Applying the patch 26fbe4bc3ef3ab0200407681cbef182af5d151de/ed9c881f3b498383f73c42712b359419da42a7b0 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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