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Review reviewHigh

CVE-2026-64266

Linux

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
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux
Affected versions
>= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 1f9156714592356b4fda57beac7eab9c2a462dd3, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 5630da218a45ba80f0aba0846cbe8aa655da122b, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 1ca605cfa59377f0143fb35b5b01360f37d1b7c4, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 0e4a5a000123d81234e27a2f8187688cf608f755, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < e6aa539720c3d8def69683ed0c07cf9faea4e8be, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < be353caffa8640f5e25fb3714ce8b0cef5e410e5, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 65a1c2551f7e16085acbb54aedde1feaa559ba7a, >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < b5befa80fdbe287a98480effed9564712924add5, >= 2.6.35
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-64266 — Linux | SECUFOCUS NOW