CVE-2026-72191Network attack vector

Kernel panic via unchecked NTFS entry size

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds write in Linux ntfs3 allows attackers to panic the kernel through a crafted NTFS image during file creation. hdr_find_split() trusts an interior NTFS_DE size, causing unsigned subtraction to underflow before indx_insert_into_buffer() passes a near-4-GiB count to memmove(). Reachability requires the crafted volume to be mounted locally or exported as a writable ntfs3-backed SMB share; triggering the flaw corrupts adjacent kernel allocations and interrupts the host.

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 write in Linux ntfs3 allows attackers to panic the kernel through a crafted NTFS image during file creation. hdr_find_split() trusts an interior NTFS_DE size, causing unsigned subtraction to underflow before indx_insert_into_buffer() passes a near-4-GiB count to memmove(). Reachability requires the crafted volume to be mounted locally or exported as a writable ntfs3-backed SMB share; triggering the flaw corrupts adjacent kernel allocations and interrupts the host.

The record

CVE
CVE-2026-72191
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
network
Privileges
unauthenticated

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=82cae269cfa953032fbb8980a7d554d60fb00b17 <1758a564b6ebe7f4a82f23c9851d1cae15549457
  3. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <7bf74e6baf810fe325f111996496c678fc6e244f
  4. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <b232eb5c9fe11ec2368e9b565db69c724c35fbd2
  5. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <f1df9d771df47aa40de6d70949c28720ae1e430d
  6. Affected versionversion=82cae269cfa953032fbb8980a7d554d60fb00b17 <f3624cc069195001c88df7a291af215f2133ff2c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <1758a564b6ebe7f4a82f23c9851d1cae15549457; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <7bf74e6baf810fe325f111996496c678fc6e244f; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <b232eb5c9fe11ec2368e9b565db69c724c35fbd2; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <f1df9d771df47aa40de6d70949c28720ae1e430d; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <f3624cc069195001c88df7a291af215f2133ff2c

Published CVSS scores

9.8LinuxCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
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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