CVE-2026-64588 - fuse-uring: fix data races on ring->ready

CVE-2026-64588 - fuse-uring: fix data races on ring->ready

https://cvefeed.io/rssfeed/latest.atom / Thu, 08/06/2026 - 13:09
CVE ID :CVE-2026-64588
Published : Aug. 6, 2026, 8:16 a.m. | 58 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: fuse-uring: fix data races on ring->ready On weakly-ordered architectures, the store to fiq->ops can be reordered past the store to ring->ready, allowing a CPU that sees ring->ready == true via fuse_uring_ready() to dispatch requests through a stale fiq->ops pointer. Upgrade the store to smp_store_release() and the load in fuse_uring_ready() to smp_load_acquire() so that the preceding WRITE_ONCE(fiq->ops, ...) is visible to any CPU that observes ring->ready == true. Additionally, fuse_uring_do_register() publishes ring->ready with WRITE_ONCE() but the fast-path check reads it with a plain load. This is a marked-vs-unmarked access that KCSAN will flag. Wrap it in READ_ONCE() to mark it without adding unnecessary ordering. Also wrap the fc->ring load in fuse_uring_ready() in READ_ONCE() to prevent the compiler from reloading it between the NULL check and the dereference.
Severity: 0.0 | NA
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