CVE-2026-64432

Kernel memory corruption via unbounded LCN copy

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds write in Linux Kernel NTFS3 journal replay allows attackers to corrupt kernel memory via a crafted NTFS image. The log_replay() analysis pass writes action-record LCNs past page_lcns[] when lcns_follow exceeds DPT capacity or a target VCN subtraction wraps. Reaching the flaw requires a victim to mount the attacker-supplied volume, after which the write can crash the kernel or corrupt adjacent kernel objects.

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

Out-of-bounds write in Linux Kernel NTFS3 journal replay allows attackers to corrupt kernel memory via a crafted NTFS image. The log_replay() analysis pass writes action-record LCNs past page_lcns[] when lcns_follow exceeds DPT capacity or a target VCN subtraction wraps. Reaching the flaw requires a victim to mount the attacker-supplied volume, after which the write can crash the kernel or corrupt adjacent kernel objects.

The record

CVE
CVE-2026-64432
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=5.15
  2. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <3aa96956ca2200674e2a8f9c23ec6ecd45e5010f
  3. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <57382ec6ac63b63dce2789e835fded28b698ae79
  4. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <946046841013ebac8492ef49651c53638d7a9a6a
  5. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <964c3fae1dfc49dde5468eace940f199cda234e9
  6. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <c6f9e804f73ef809529865fbc7256dd189ff8c33
  7. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <cf28fc1658463d768657cf1c27a83980d4ba7ef2
  8. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <f433acc85b86f327d03ba8b03a33c105c51053de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15; version=b46acd6a6a627d876898e1c84d3f84902264b445 <3aa96956ca2200674e2a8f9c23ec6ecd45e5010f; version=b46acd6a6a627d876898e1c84d3f84902264b445 <57382ec6ac63b63dce2789e835fded28b698ae79; version=b46acd6a6a627d876898e1c84d3f84902264b445 <946046841013ebac8492ef49651c53638d7a9a6a; version=b46acd6a6a627d876898e1c84d3f84902264b445 <964c3fae1dfc49dde5468eace940f199cda234e9; version=b46acd6a6a627d876898e1c84d3f84902264b445 <c6f9e804f73ef809529865fbc7256dd189ff8c33; version=b46acd6a6a627d876898e1c84d3f84902264b445 <cf28fc1658463d768657cf1c27a83980d4ba7ef2; version=b46acd6a6a627d876898e1c84d3f84902264b445 <f433acc85b86f327d03ba8b03a33c105c51053de

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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