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Vulnerability record · CVE-2026-64266 · published 25 July 2026

CVE-2026-64266: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.16% · top 95.0% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64266), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.