Linux Kernel fuse-uring race condition

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel. This impacts the function fuse_uring_commit_fetch/fuse_uring_abort_end_requests of the component fuse-uring. The manipulation results in race condition. This vulnerability is known as CVE-2026-64260. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel (version unknown). Affected is the function fuse_uring_commit_fetch/fuse_uring_abort_end_requests of the component fuse-uring. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: fuse-uring: Avoid queue->stopped races and set/read that value under lock There are several readers of queue->stopped that check the value under lock, but fuse_uring_commit_fetch() did not and actually the value was not set under the lock in fuse_uring_abort_end_requests() either. Especially in fuse_uring_commit_fetch it is important to check under a lock, because due to races 'struct fuse_req' might be freed with fuse_request_end, but another thread/cpu might already do teardown work.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-64260 since 07/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/25/2026).

Applying the patch 39c8e925b207afceffaa5382416ed405e0223a03/4021a3a79eee551d95fe1e1e7c1b195d34ba8c08/b70a3aca16934c196f92abb17b01c1647b9bb63c is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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