Linux Kernel up to 7.2.2 fuse fuse_uring_create_queue race condition

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.2. This impacts the function fuse_uring_create_queue of the component fuse. The manipulation leads to race condition. This vulnerability is uniquely identified as CVE-2026-80858. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.2 and classified as very critical. This issue affects the function fuse_uring_create_queue of the component fuse. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: fuse: publish io-uring queues with release semantics fuse_uring_create_queue() initializes a fuse_ring_queue and then publishes the pointer into ring->queues[qid] with WRITE_ONCE() under the fch->lock. There are several readers that may concurrently be fetching that pointer locklessly and then deferencing it. WRITE_ONCE() doesn't ensure ordering of the queue's field initialization before the ring->queues[qid] pointer assignment. The queue must be published with smp_store_release() so the field initialization is guaranteed to happen before. Readers in paths where the read may happen concurrently with the store need to use READ_ONCE() because any race involving a plain access is undefined.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-80858 since 08/26/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/04/2026).

Upgrading to version 7.2.3 or 7.3-rc1 eliminates this vulnerability. Applying the patch a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa/42df916e5a5f8fb4b60c8cefb54318d1ec02c580 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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