CVE-2026-64266 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

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

EPSS — Exploit Prediction

0.0016

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-64266? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64266? +

CVE-2026-64266 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0016, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-64266? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-64266