CVE-2026-46155Network attack vector

Kernel data disclosure via oversized SMB response copy

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds read in the Linux Kernel SMB client allows remote attackers to disclose kernel heap data through a crafted server response. check_wsl_eas() accepts an early-terminated EA list without validating OutputBufferLength against iov_len, and smb2_compound_op() then copies that length past the response allocation. An already-mounted malicious or intercepted SMB share is required; routine metadata queries can reflect leaked bytes to local processes or trigger a kernel crash, without providing a memory-write primitive.

CVSS severity9.1
Critical
EPSS probability0.48%
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 Kernel SMB client allows remote attackers to disclose kernel heap data through a crafted server response. check_wsl_eas() accepts an early-terminated EA list without validating OutputBufferLength against iov_len, and smb2_compound_op() then copies that length past the response allocation. An already-mounted malicious or intercepted SMB share is required; routine metadata queries can reflect leaked bytes to local processes or trigger a kernel crash, without providing a memory-write primitive.

The record

CVE
CVE-2026-46155
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=6.6.32 <6.6.140
  2. Affected versionversion=6.9
  3. Affected versionversion=7449d736bbbd160c76b01b8fcdf72f58a8757d4b <dffb44b2e06a2908e249f0f93156fc987eee1d1c
  4. Affected versionversion=ea41367b2a602f602ea6594fc4a310520dcc64f4 <512d33bc8ea4ea5c19728ee118715f4b1f4d1926
  5. Affected versionversion=ea41367b2a602f602ea6594fc4a310520dcc64f4 <8d09328dfda089675e4c049f3f256064a1d1996b
  6. Affected versionversion=ea41367b2a602f602ea6594fc4a310520dcc64f4 <9b3af35645ff9cd334edc130249f9a2fb2bea25f
  7. Affected versionversion=ea41367b2a602f602ea6594fc4a310520dcc64f4 <a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.6.32 <6.6.140; version=6.9; version=7449d736bbbd160c76b01b8fcdf72f58a8757d4b <dffb44b2e06a2908e249f0f93156fc987eee1d1c; version=ea41367b2a602f602ea6594fc4a310520dcc64f4 <512d33bc8ea4ea5c19728ee118715f4b1f4d1926; version=ea41367b2a602f602ea6594fc4a310520dcc64f4 <8d09328dfda089675e4c049f3f256064a1d1996b; version=ea41367b2a602f602ea6594fc4a310520dcc64f4 <9b3af35645ff9cd334edc130249f9a2fb2bea25f; version=ea41367b2a602f602ea6594fc4a310520dcc64f4 <a16f70a71be4b5a4eccf39a9bf09b47285f4cb7c

Published CVSS scores

9.1Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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.

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)
Vectornetwork
Privilegesunauthenticated
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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