CVE-2026-64259

CVE CVE-2026-64259EUVD EUVD-2026-48971Published 2026-07-25T08:49:10.000ZLast changed 2026-08-05T12:40:20.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: fuse-uring: make a fuse_req on SQE commit only findable after memcpy Bad userspace might try to trick us and send commit SQEs request unique / commit-id of requests that are not even send to fuse-server (io_uring_cmd_done() not called) yet. fuse_uring_commit_fetch() ends the fuse request when the ring entry has a wrong state, but that could have caused a use-after-free with the memcpy operations in fuse_uring_send_in_task(). In order to avoid such races the call of fuse_uring_add_to_pq() is moved after the copy operations and just before completing the io-uring request - malicious userspace cannot find the request anymore until all prepration work in fuse-client/kernel is completed. This also moves fuse_uring_add_to_pq() a bit up in the code to avoid a forward declaration. Also not with a preparation commit, to make it easier to back port to older kernels.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.18.39; 6.14; c090c8abae4b6b77a1bee116aa6c385456ebef96 <a635f427d57e2012102ae4886b48d8955c59fb86; patch: 7.2-rc1; c090c8abae4b6b77a1bee116aa6c385456ebef96 <1efd3d474fc0ba74dfd984249bca78807d739812; c090c8abae4b6b77a1bee116aa6c385456ebef96 <e1711479e9068ea31b31353a702a51e639c3d059; patch: 7.1.4; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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