CVE-2026-64588: 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 reorde

unknownCVE-2026-64588

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-08-06
Last updated: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-64588

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-645880.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64588	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[NEW] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund

Recent advisories for In the Linux

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-68480: In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Make Safe-RET ro…nvd · 2026-08-06
criticalCVE-2026-19149: Use after free in Aura in Google Chrome on Linux prior to 151.0.7922.109 allowed a remote atta…nvd · 2026-08-06
unknownCVE-2026-19148: Out of bounds write in GPU in Google Chrome on Linux prior to 151.0.7922.109 allowed a remote …nvd · 2026-08-06
unknownCVE-2026-19147: Use after free in Aura in Google Chrome on Linux prior to 151.0.7922.109 allowed a remote atta…nvd · 2026-08-06
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund · 2026-08-06
medium[NEW] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund · 2026-08-06