Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2025-39691

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fs/buffer: fix use-after-free when call bh_read() helper There's issue as follows: BUG: KASAN: stack-out-of-bounds in end_buffe…

Published Sep 5, 2025CWE-416EPSS 0.19%

Overview

CVE-2025-39691 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

fs/buffer: fix use-after-free when call bh_read() helper

There's issue as follows:

BUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110

Read of size 8 at addr ffffc9000168f7f8 by task swapper/3/0

CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)

Call Trace:

<IRQ>

dump_stack_lvl+0x55/0x70

print_address_description.constprop.0+0x2c/0x390

print_report+0xb4/0x270

kasan_report+0xb8/0xf0

end_buffer_read_sync+0xe3/0x110

end_bio_bh_io_sync+0x56/0x80

blk_update_request+0x30a/0x720

scsi_end_request+0x51/0x2b0

scsi_io_completion+0xe3/0x480

? scsi_device_unbusy+0x11e/0x160

blk_complete_reqs+0x7b/0x90

handle_softirqs+0xef/0x370

irq_exit_rcu+0xa5/0xd0

sysvec_apic_timer_interrupt+0x6e/0x90

</IRQ>

Above issue happens when do ntfs3 filesystem mount, issue may happens

as follows:

mount IR

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/03b40bf5d0389ca23ae6857ee25789f0e0b47ce8Refgit.kernel.org/stable/c/042cf48ecf67f72c8b3846c7fac678f472712ff3Refgit.kernel.org/stable/c/3169edb8945c295cf89120fc6b2c35cfe3ad4c9eRefgit.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9Refgit.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49Refgit.kernel.org/stable/c/90b5193edb323fefbee0e4e5bc39ed89dcc37719Refgit.kernel.org/stable/c/c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4Refgit.kernel.org/stable/c/c5aa6ba1127307ab5dc3773eaf40d73a3423841fReflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39691?

CVE-2025-39691 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39691?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39691?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39691?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39691 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2025

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999