CVE-2025-39888

HighCVSS 7.8/10Last modified Oct 19, 2026

Description

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-787

Affected software

VendorProductVersions
LinuxLinux>= 3568a956932621cafadafc8b75fcf6dc06555105, < 623719227b114d73a2cee45f1b343ced63ce09ec; >= 3568a956932621cafadafc8b75fcf6dc06555105, < 9d81ba6d49a7457784f0b6a71046818b86ec7e44
LinuxLinux6.16

References

Timeline

Published
Sep 23, 2025
Last modified
Oct 19, 2026
NVD status
Modified

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CVE-2025-39888: High severity, CVSS 7.8 | Vulnix