CVE-2026-64532Hinoki check available

Kernel memory corruption via unchecked NTFS view offset

Published Jul 27, 2026 · Updated Jul 27, 2026

Out-of-bounds write in Linux Kernel 5.15 and later allows attackers to corrupt kernel memory through a crafted NTFS volume. In fs/ntfs3/fslog.c, do_action() forms two memmove destinations from the on-disk NTFS_DE view.data_off without bounding the offset plus dlen by the entry size. Exploitation requires a privileged victim to mount the supplied filesystem read-write; the deterministic heap overwrite can disclose or corrupt kernel data and panic the system.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds write in Linux Kernel 5.15 and later allows attackers to corrupt kernel memory through a crafted NTFS volume. In fs/ntfs3/fslog.c, do_action() forms two memmove destinations from the on-disk NTFS_DE view.data_off without bounding the offset plus dlen by the entry size. Exploitation requires a privileged victim to mount the supplied filesystem read-write; the deterministic heap overwrite can disclose or corrupt kernel data and panic the system.

The record

CVE
CVE-2026-64532
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-120, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=5.15
  2. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <315d3a9a48b49f889da3d858a9307e677cb9e1bd
  3. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <36feda687afebae24c472202694448738809c411
  4. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <3e127829e57f5190f612412ece4541cb96d5ec7a
  5. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <429d653ca641d38a78609b8f62e81a0a5c780a2d
  6. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <b20e5a709d8bd190d6e4645606763c7423e694c1
  7. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <be306b8d9143a9c076c804a7ca025d69caf9c448
  8. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <d41b382068ca4e64e421f736cdd700095464b6ac

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15; version=b46acd6a6a627d876898e1c84d3f84902264b445 <315d3a9a48b49f889da3d858a9307e677cb9e1bd; version=b46acd6a6a627d876898e1c84d3f84902264b445 <36feda687afebae24c472202694448738809c411; version=b46acd6a6a627d876898e1c84d3f84902264b445 <3e127829e57f5190f612412ece4541cb96d5ec7a; version=b46acd6a6a627d876898e1c84d3f84902264b445 <429d653ca641d38a78609b8f62e81a0a5c780a2d; version=b46acd6a6a627d876898e1c84d3f84902264b445 <b20e5a709d8bd190d6e4645606763c7423e694c1; version=b46acd6a6a627d876898e1c84d3f84902264b445 <be306b8d9143a9c076c804a7ca025d69caf9c448; version=b46acd6a6a627d876898e1c84d3f84902264b445 <d41b382068ca4e64e421f736cdd700095464b6ac

Published CVSS scores

7.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS: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

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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

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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