CVE-2026-72195

Kernel memory exposure via resident-size underflow

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in Linux kernel ntfs3 allows local users to expose kernel memory by mounting a crafted NTFS journal. In do_action's UpdateResidentValue case, unchecked on-disk attr_off and redo_len values make a subtraction underflow data_size to nearly 4 GiB, so later resident-attribute reads pass the 1,024-byte MFT allocation. Triggering the flaw requires mounting an attacker-controlled NTFS volume and replaying its journal; full attribute walks instead reject the corrupted size and fail the mount.

CVSS severity7.8
High
EPSS probability0.17%
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 Linux kernel ntfs3 allows local users to expose kernel memory by mounting a crafted NTFS journal. In do_action's UpdateResidentValue case, unchecked on-disk attr_off and redo_len values make a subtraction underflow data_size to nearly 4 GiB, so later resident-attribute reads pass the 1,024-byte MFT allocation. Triggering the flaw requires mounting an attacker-controlled NTFS volume and replaying its journal; full attribute walks instead reject the corrupted size and fail the mount.

The record

CVE
CVE-2026-72195
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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 <50b5e83384e7fed3d11d18b79ff350e9d6d89861
  3. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <53c12f178f584dc5f836ffe2782138a6e9348ed9
  4. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <546518468e6c9ea469669eef78f8cc380ad6e2ca
  5. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <97758fd9756b5f09e9ddc6a5f6a569041acc8421
  6. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <a89c66674283a0293c0f266dc57087a6114371a3
  7. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <ab8761676d638c5be170aaf91b7ffdd451236616
  8. Affected versionversion=b46acd6a6a627d876898e1c84d3f84902264b445 <d1570c48f49a693974d000251030370ee2e83539

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=b46acd6a6a627d876898e1c84d3f84902264b445 <50b5e83384e7fed3d11d18b79ff350e9d6d89861; version=b46acd6a6a627d876898e1c84d3f84902264b445 <53c12f178f584dc5f836ffe2782138a6e9348ed9; version=b46acd6a6a627d876898e1c84d3f84902264b445 <546518468e6c9ea469669eef78f8cc380ad6e2ca; version=b46acd6a6a627d876898e1c84d3f84902264b445 <97758fd9756b5f09e9ddc6a5f6a569041acc8421; version=b46acd6a6a627d876898e1c84d3f84902264b445 <a89c66674283a0293c0f266dc57087a6114371a3; version=b46acd6a6a627d876898e1c84d3f84902264b445 <ab8761676d638c5be170aaf91b7ffdd451236616; version=b46acd6a6a627d876898e1c84d3f84902264b445 <d1570c48f49a693974d000251030370ee2e83539

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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