CVE-2025-37779

System crash via cross-folio bvec coalescing

Published May 1, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel 6.14 through 6.14.3 allows local users to crash the host by reading an affected file-backed mount. lib/iov_iter.c coalesces bvec pages across a folio boundary without incrementing every non-slab folio reference, causing p9_release_pages to over-release a folio. Reachability requires a locally readable file-backed EROFS or loop-backed mount over 9p, NFS, or Ceph; the resulting bad-page state can corrupt kernel memory or crash the host.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel 6.14 through 6.14.3 allows local users to crash the host by reading an affected file-backed mount. lib/iov_iter.c coalesces bvec pages across a folio boundary without incrementing every non-slab folio reference, causing p9_release_pages to over-release a folio. Reachability requires a locally readable file-backed EROFS or loop-backed mount over 9p, NFS, or Ceph; the resulting bad-page state can corrupt kernel memory or crash the host.

The record

CVE
CVE-2025-37779
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.14
  2. Affected versionversion=b9c0e49abfca06f1a109acea834bcfc934f33f76 <770c8d55c42868239c748a3ebc57c9e37755f842
  3. Affected versionversion=b9c0e49abfca06f1a109acea834bcfc934f33f76 <d833f21162c4d536d729628f8cf1ee8d4110f2b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=b9c0e49abfca06f1a109acea834bcfc934f33f76 <770c8d55c42868239c748a3ebc57c9e37755f842; version=b9c0e49abfca06f1a109acea834bcfc934f33f76 <d833f21162c4d536d729628f8cf1ee8d4110f2b7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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