Bug 2507098 (CVE-2026-64266) - CVE-2026-64266 kernel: fuse: re-lock request before returning from fuse_ref_folio()
Summary: CVE-2026-64266 kernel: fuse: re-lock request before returning from fuse_ref_f...
Keywords:
Status: NEW
Alias: CVE-2026-64266
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-25 10:04 UTC by OSIDB Bzimport
Modified: 2026-10-31 15:55 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:87374 0 None None None 2026-10-21 20:10:13 UTC
Red Hat Product Errata RHSA-2026:87375 0 None None None 2026-10-21 20:24:42 UTC
Red Hat Product Errata RHSA-2026:88477 0 None None None 2026-10-23 00:37:09 UTC
Red Hat Product Errata RHSA-2026:90365 0 None None None 2026-10-26 21:02:46 UTC

Description OSIDB Bzimport 2026-07-25 10:04:53 UTC 
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.
Comment 1 TEJ RATHI 2026-07-30 06:36:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072558-CVE-2026-64266-67e6@gregkh/T
Comment 4 Jon Orris 2026-10-21 20:10:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:87374 https://access.redhat.com/errata/RHSA-2026:87374
Comment 5 Jon Orris 2026-10-21 20:24:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:87375 https://access.redhat.com/errata/RHSA-2026:87375
Comment 6 Jon Orris 2026-10-23 00:37:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:88477 https://access.redhat.com/errata/RHSA-2026:88477
Comment 7 Jon Orris 2026-10-26 21:02:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:90365 https://access.redhat.com/errata/RHSA-2026:90365
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