Is CVE-2025-38256 in the CISA KEV catalog?

No. CVE-2025-38256 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-38256?

CVE-2025-38256 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2025-38256?

CVE-2025-38256 has an EPSS score of 0.14% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-38256?

Upgrade linux on debian 13 to 6.12.37-1 or later. Fixes are available for 50 affected products.

CVE & CISA-KEV Catalog

CVE-2025-38256

MEDIUM

5.5

CVSS v3

NVD

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] worker_thread+0x958/0xed8 [ 108.197561][ T14] kthread+0x5fc/0x75c [ 108.199362][ T14] ret_from_fork+0x10/0x20 We can pin a tail page of a folio, but then io_uring will try to unpin the head page of the folio. While it should be fine in terms of keeping the page actually alive, mm folks say it's wrong and triggers a debug warning. Use unpin_user_folio() instead of unpin_user_page*. [axboe: adapt to current tree, massage commit message]

How to fix

Remediation Available

linuxDebian

Fixed in:6.12.37-1CVE-2025-38256

linux-aws-6.14Ubuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-azure-6.14Ubuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7834-1

linux-azure-nvidia-6.14Ubuntu

Fixed in:6.14.0-1007.7USN-7834-1

linux-gcp-6.14Ubuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-hwe-6.14Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-6.14.0-1007-azure-nvidiaUbuntu

Fixed in:6.14.0-1007.7USN-7834-1

linux-image-6.14.0-1014-azureUbuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7834-1

linux-image-6.14.0-1014-oemUbuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-image-6.14.0-1014-realtimeUbuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7833-2

linux-image-6.14.0-1015-awsUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-image-6.14.0-1015-aws-64kUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-image-6.14.0-1015-oracleUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-image-6.14.0-1015-oracle-64kUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-image-6.14.0-1018-gcpUbuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-image-6.14.0-1018-gcp-64kUbuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-image-6.14.0-34-genericUbuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-6.14.0-34-generic-64kUbuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-awsUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-image-aws-6.14Ubuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-image-aws-64kUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-image-aws-64k-6.14Ubuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-3

linux-image-azureUbuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7834-1

linux-image-azure-6.14Ubuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7834-1

linux-image-azure-nvidiaUbuntu

Fixed in:6.14.0-1007.7USN-7834-1

linux-image-azure-nvidia-6.14Ubuntu

Fixed in:6.14.0-1007.7USN-7834-1

linux-image-gcpUbuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-image-gcp-6.14Ubuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-image-gcp-64kUbuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-image-gcp-64k-6.14Ubuntu

Fixed in:6.14.0-1018.19~24.04.1USN-7833-4

linux-image-generic-6.14Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-generic-64k-6.14Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-generic-64k-hwe-24.04Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-generic-hwe-24.04Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-oem-24.04Ubuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-image-oem-24.04aUbuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-image-oem-24.04bUbuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-image-oem-24.04cUbuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-image-oem-6.14Ubuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-image-oracleUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-image-oracle-6.14Ubuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-image-oracle-64kUbuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-image-oracle-64k-6.14Ubuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-image-realtime-6.14Ubuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7833-2

linux-image-realtime-hwe-24.04Ubuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7833-2

linux-image-virtual-6.14Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-image-virtual-hwe-24.04Ubuntu

Fixed in:6.14.0-34.34~24.04.1USN-7856-1

linux-oem-6.14Ubuntu

Fixed in:6.14.0-1014.14USN-7833-1

linux-oracle-6.14Ubuntu

Fixed in:6.14.0-1015.15~24.04.1USN-7833-1

linux-realtime-6.14Ubuntu

Fixed in:6.14.0-1014.14~24.04.1USN-7833-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.14%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Patch3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-19.