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High severity7.8NVD Advisory· Published Sep 23, 2025· Updated Jun 17, 2026

CVE-2025-39888

CVE-2025-39888

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.

Affected products

9

Linux/Kernel8 versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 7 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.16,<6.16.8
- cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
- (no CPE)
- (no CPE)range: 6.16
osv-coords
pkg:linux/kernel
Range: >= 6.16.0, < 6.16.8

Patches

Vulnerability mechanics

References

2

News mentions

0

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