{"id":"CVE-2026-80858","summary":"fuse: publish io-uring queues with release semantics","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: publish io-uring queues with release semantics\n\nfuse_uring_create_queue() initializes a fuse_ring_queue and then\npublishes the pointer into ring-\u003equeues[qid] with WRITE_ONCE() under the\nfch-\u003elock. There are several readers that may concurrently be fetching\nthat pointer locklessly and then deferencing it.\n\nWRITE_ONCE() doesn't ensure ordering of the queue's field\ninitialization before the ring-\u003equeues[qid] pointer assignment. The\nqueue must be published with smp_store_release() so the field\ninitialization is guaranteed to happen before.\n\nReaders in paths where the read may happen concurrently with the store\nneed to use READ_ONCE() because any race involving a plain access is\nundefined.","modified":"2026-09-06T03:46:54.475254525Z","published":"2026-09-04T15:55:12.442Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80858.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/42df916e5a5f8fb4b60c8cefb54318d1ec02c580"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80858.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80858"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"24fe962c86f55347385933a1b06ca71b60854690"},{"fixed":"a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa"},{"fixed":"42df916e5a5f8fb4b60c8cefb54318d1ec02c580"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80858.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.14.0"},{"fixed":"7.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80858.json"}}],"schema_version":"1.9.0"}