CVE-2026-46078

Memory disclosure or crash via unchecked nameoff

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds read in the EROFS directory parser in Linux Kernel allows local users to read kernel memory or crash via a crafted image. The trailing-dirent path subtracts an unchecked nameoff from maxsize; an oversized offset underflows the length passed to strnlen(), which reads beyond the directory block. Exploitation requires local delivery and user interaction that causes the kernel to parse the crafted EROFS filesystem image.

CVSS severity7.1
High
EPSS probability0.13%
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 EROFS directory parser in Linux Kernel allows local users to read kernel memory or crash via a crafted image. The trailing-dirent path subtracts an unchecked nameoff from maxsize; an oversized offset underflows the length passed to strnlen(), which reads beyond the directory block. Exploitation requires local delivery and user interaction that causes the kernel to parse the crafted EROFS filesystem image.

The record

CVE
CVE-2026-46078
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=3aa8ec716e52c02360457fa018296629b4d0becf <1d55445226c75ddd4e78b09b3e7d99109b28c366
  2. Affected versionversion=3aa8ec716e52c02360457fa018296629b4d0becf <222055e6b4063abd2d9e13c3d49bbd1724c50789
  3. Affected versionversion=3aa8ec716e52c02360457fa018296629b4d0becf <48b27a955d22391c7f30169fa7b6b2e1977f1ce4
  4. Affected versionversion=3aa8ec716e52c02360457fa018296629b4d0becf <8ebb951a284b7446e025afc7dc5e9516ef9a7214
  5. Affected versionversion=3aa8ec716e52c02360457fa018296629b4d0becf <d18a3b5d337fa412a38e776e6b4b857a58836575
  6. Affected versionversion=4.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3aa8ec716e52c02360457fa018296629b4d0becf <1d55445226c75ddd4e78b09b3e7d99109b28c366; version=3aa8ec716e52c02360457fa018296629b4d0becf <222055e6b4063abd2d9e13c3d49bbd1724c50789; version=3aa8ec716e52c02360457fa018296629b4d0becf <48b27a955d22391c7f30169fa7b6b2e1977f1ce4; version=3aa8ec716e52c02360457fa018296629b4d0becf <8ebb951a284b7446e025afc7dc5e9516ef9a7214; version=3aa8ec716e52c02360457fa018296629b4d0becf <d18a3b5d337fa412a38e776e6b4b857a58836575; version=4.19

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002Malicious File

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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