CVE-2025-40241

Kernel memory corruption via malformed EROFS extents

Published Dec 4, 2025 · Updated Aug 5, 2026

Memory corruption in Linux kernel 6.15 through 6.17.5 allows local users to compromise the kernel by reading a crafted mounted EROFS image. An encoded extent with an out-of-range 48-bit physical address makes pointer addition wrap in z_erofs_submit_queue(), causing out-of-bounds access to pcl->compressed_bvecs[]. An attacker-controlled image must be mounted, after which ordinary file-read access can expose or overwrite kernel heap data and crash the system.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux kernel 6.15 through 6.17.5 allows local users to compromise the kernel by reading a crafted mounted EROFS image. An encoded extent with an out-of-range 48-bit physical address makes pointer addition wrap in z_erofs_submit_queue(), causing out-of-bounds access to pcl->compressed_bvecs[]. An attacker-controlled image must be mounted, after which ordinary file-read access can expose or overwrite kernel heap data and crash the system.

The record

CVE
CVE-2025-40241
Published
Dec 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 4, 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=1d191b4ca51d73699cb127386b95ac152af2b930 <00d8fe0b72f4ca0a983abced36aad2160038c421
  2. Affected versionversion=1d191b4ca51d73699cb127386b95ac152af2b930 <a429b76114aaca3ef1aff4cd469dcf025431bd11
  3. Affected versionversion=6.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1d191b4ca51d73699cb127386b95ac152af2b930 <00d8fe0b72f4ca0a983abced36aad2160038c421; version=1d191b4ca51d73699cb127386b95ac152af2b930 <a429b76114aaca3ef1aff4cd469dcf025431bd11; version=6.15

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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