Bug 2397565 (CVE-2025-39888) - CVE-2025-39888 kernel: fuse: Block access to folio overlimit
Summary: CVE-2025-39888 kernel: fuse: Block access to folio overlimit
Keywords:
Status: NEW
Alias: CVE-2025-39888
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: 2025-09-23 07:02 UTC by OSIDB Bzimport
Modified: 2025-09-26 13:48 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2025-09-23 07:02:00 UTC
In the Linux kernel, the following vulnerability has been resolved:

fuse: Block access to folio overlimit

syz reported a slab-out-of-bounds Write in fuse_dev_do_write.

When the number of bytes to be retrieved is truncated to the upper limit
by fc->max_pages and there is an offset, the oob is triggered.

Add a loop termination condition to prevent overruns.


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