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CVE-2025-38256

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: fix folio unpinning syzbot complains about an unmapping failure: [ 108.070381][ T14] kernel BUG at mm/gup.c:71!

Published Jul 9, 2025EPSS 0.17%

Overview

CVE-2025-38256 is a medium-severity vulnerability. It was published on July 9, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

io_uring/rsrc: fix folio unpinning

syzbot complains about an unmapping failure:

[ 108.070381][ T14] kernel BUG at mm/gup.c:71!

[ 108.070502][ T14] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP

[ 108.123672][ T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025

[ 108.127458][ T14] Workqueue: iou_exit io_ring_exit_work

[ 108.174205][ T14] Call trace:

[ 108.175649][ T14] sanity_check_pinned_pages+0x7cc/0x7d0 (P)

[ 108.178138][ T14] unpin_user_page+0x80/0x10c

[ 108.180189][ T14] io_release_ubuf+0x84/0xf8

[ 108.182196][ T14] io_free_rsrc_node+0x250/0x57c

[ 108.184345][ T14] io_rsrc_data_free+0x148/0x298

[ 108.186493][ T14] io_sqe_buffers_unregister+0x84/0xa0

[ 108.188991][ T14] io_ring_ctx_free+0x48/0x480

[ 108.191057][ T14] io_ring_exit_work+0x764/0x7d8

[ 108.193207][ T14] process_one_work+0x7e8/0x155c

[ 108.195431][ T14] worke

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/11e7b7369e655e6131387b174218d7fa9557b3daRefgit.kernel.org/stable/c/53fd75f25b223878b5fff14932e3a22f42b54f77Refgit.kernel.org/stable/c/5afb4bf9fc62d828647647ec31745083637132e4

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38256?

CVE-2025-38256 is a medium-severity vulnerability. It was published on July 9, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38256?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38256?

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-2025-38256?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38256 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.

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