What’s Vulnerable › Vulnerabilities

CVE-2026-64266: fuse: re-lock request before returning from fuse_ref_folio()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-10-19
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues. Fix this by locking the request in fuse_ref_folio() before returning.

Affected products

• Linux kernel: from 2.6.35 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39 — fixed in 5.10.261, 5.15.212, 6.1.178, 6.12.96, 6.18.39, 6.6.145

How to fix

Upgrade to a fixed version: Linux kernel 5.10.261, 5.15.212, 6.1.178, 6.12.96. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755
• https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4
• https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3
• https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b
• https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a
• https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5
• https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5
• https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be

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