CVE-2026-46195Network attack vector

Kernel memory corruption via wrapped DACL pointer

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds access in the Linux Kernel SMB client allows remote attackers to corrupt kernel memory through a crafted SMB DACL offset. parse_sec_desc(), build_sec_desc(), and id_mode_to_cifs_acl() add the server-supplied dacloffset to pntsd before proving that a DACL header fits, so 32-bit arithmetic can wrap the pointer below end_of_acl and evade later checks. Exploitation requires a 32-bit build and client processing of a malicious server security descriptor; chmod or chown rewrite paths then dereference fields through the wrapped pointer.

CVSS severity9.8
Critical
EPSS probability0.68%
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 access in the Linux Kernel SMB client allows remote attackers to corrupt kernel memory through a crafted SMB DACL offset. parse_sec_desc(), build_sec_desc(), and id_mode_to_cifs_acl() add the server-supplied dacloffset to pntsd before proving that a DACL header fits, so 32-bit arithmetic can wrap the pointer below end_of_acl and evade later checks. Exploitation requires a 32-bit build and client processing of a malicious server security descriptor; chmod or chown rewrite paths then dereference fields through the wrapped pointer.

The record

CVE
CVE-2026-46195
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, CWE-787, T1203
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.12
  2. Affected versionversion=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <3b1ddba19e77ee35241cd27f16dc3e8d14e08db7
  3. Affected versionversion=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <8bd07e417b6bda67e317920584e48cb6ee442a8a
  4. Affected versionversion=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <ba7f71b6161c0943dafc367565e5843d16b7d505
  5. Affected versionversion=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <c688f3ed73d31943334ad2139cb02ec49664322a
  6. Affected versionversion=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <f98b48151cc502ada59d9778f0112d21f2586ca3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.12; version=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <3b1ddba19e77ee35241cd27f16dc3e8d14e08db7; version=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <8bd07e417b6bda67e317920584e48cb6ee442a8a; version=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <ba7f71b6161c0943dafc367565e5843d16b7d505; version=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <c688f3ed73d31943334ad2139cb02ec49664322a; version=bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 <f98b48151cc502ada59d9778f0112d21f2586ca3

Published CVSS scores

7.5Red Hat Security Data APICVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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.

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-476NULL Pointer Dereference
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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