CVE-2025-37739

Kernel memory disclosure and crash via inode truncation

Published May 1, 2025 · Updated May 11, 2026

Out-of-bounds read in the Linux F2FS implementation allows local users to disclose kernel memory or crash the system. During zero-length inode truncation, f2fs_do_truncate_blocks can leave free_from at zero when a reused NAT address yields a non-inode node page; f2fs_truncate_inode_blocks then passes zero offsets to get_nid, which indexes i_nid at -924. Exploitation requires low-privileged local access and an affected F2FS state involving reused node-block addresses.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux F2FS implementation allows local users to disclose kernel memory or crash the system. During zero-length inode truncation, f2fs_do_truncate_blocks can leave free_from at zero when a reused NAT address yields a non-inode node page; f2fs_truncate_inode_blocks then passes zero offsets to get_nid, which indexes i_nid at -924. Exploitation requires low-privileged local access and an affected F2FS state involving reused node-block addresses.

The record

CVE
CVE-2025-37739
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.8
  2. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <67e16ccba74dd8de0a7b10062f1e02d77432f573
  3. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <6ba8b41d0aa4b82f90f0c416cb53fcef9696525d
  4. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <8b5e5aac44fee122947a269f9034c048e4c295de
  5. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <98dbf2af63de0b551082c9bc48333910e009b09f
  6. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <a67e1bf03c609a751d1740a1789af25e599966fa
  7. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <d7242fd7946d4cba0411effb6b5048ca55125747
  8. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <e6494977bd4a83862118a05f57a8df40256951c0
  9. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <ecc461331604b07cdbdb7360dbdf78471653264c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <67e16ccba74dd8de0a7b10062f1e02d77432f573; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <6ba8b41d0aa4b82f90f0c416cb53fcef9696525d; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <8b5e5aac44fee122947a269f9034c048e4c295de; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <98dbf2af63de0b551082c9bc48333910e009b09f; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <a67e1bf03c609a751d1740a1789af25e599966fa; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <d7242fd7946d4cba0411effb6b5048ca55125747; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <e6494977bd4a83862118a05f57a8df40256951c0; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <ecc461331604b07cdbdb7360dbdf78471653264c

Published CVSS scores

7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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