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CVE-2025-37779

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: lib/iov_iter: fix to increase non slab folio refcount When testing EROFS file-backed mount over v9fs on qemu, I encountered a f…

Published May 1, 2025CWE-415EPSS 0.17%

Overview

CVE-2025-37779 is a high-severity vulnerability. It was published on May 1, 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:

lib/iov_iter: fix to increase non slab folio refcount

When testing EROFS file-backed mount over v9fs on qemu, I encountered a

folio UAF issue. The page sanity check reports the following call trace.

The root cause is that pages in bvec are coalesced across a folio bounary.

The refcount of all non-slab folios should be increased to ensure

p9_releas_pages can put them correctly.

BUG: Bad page state in process md5sum pfn:18300

page: refcount:0 mapcount:0 mapping:00000000d5ad8e4e index:0x60 pfn:0x18300

head: order:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0

aops:z_erofs_aops ino:30b0f dentry name(?):"GoogleExtServicesCn.apk"

flags: 0x100000000000041(locked|head|node=0|zone=1)

raw: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0

raw: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000

head: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0

head: 000

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/770c8d55c42868239c748a3ebc57c9e37755f842Refgit.kernel.org/stable/c/d833f21162c4d536d729628f8cf1ee8d4110f2b7

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37779?

CVE-2025-37779 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-37779?

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-2025-37779?

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-2025-37779?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37779 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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