CVE-2026-72018 - Vulnerability Details

- dibs: loopback: validate offset and size in move_data()

Description

In the Linux kernel, the following vulnerability has been resolved:

dibs: loopback: validate offset and size in move_data()

The loopback move_data() performs a memcpy into the registered DMB
without checking whether offset + size exceeds the DMB length. Unlike
real ISM hardware, which enforces memory region bounds natively, the
software loopback has no such protection.

A peer-supplied out-of-bounds offset or oversized write would result in
an OOB write past the allocated kernel buffer. Add an explicit bounds
check before the memcpy to reject such requests with -EINVAL.

Published: 2026-08-15

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability involves an out‑of‑bounds write in the Linux kernel's loopback move_data() routine. When a peer supplies an offset or size that exceeds the DMB buffer length, the unvalidated memcpy writes past the allocated kernel buffer. This results in kernel memory corruption and can destabilize or crash the system. The weakness is a classic buffer overrun (CWE-119).

Affected Systems

The flaw exists in all Linux kernel releases that implement the loopback move_data routine without the bounds check added by commit 78237e3c0720fcc6eb9b87e90fd70f63eeca886f. These kernels appear in Linux distributions shipping an unpatched kernel prior to that patch; no specific version range is enumerated in the advisory. Consequently, any system with an unpatched Linux kernel containing the unprotected loopback move_data is potentially impacted.

Risk and Exploitability

The risk is a high‑severity kernel memory corruption, reflected by a CVSS score of 7.8 and an EPSS score of <1%, indicating a very low likelihood of exploitation. It is not listed in the CISA KEV catalog. Attack requires local or privileged access to perform loopback device operations with crafted offset or size parameters. The likely attack vector is local or privileged; no documented remote exploitation path exists. The vulnerability could lead to instability or denial of service, warranting prompt patching.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`f7a22071dbf316c982fb44308874bd7ad9ac2091`	affected	< ee188a6b264b71315a67f1b9470faad308b730d2
`f7a22071dbf316c982fb44308874bd7ad9ac2091`	affected	< b2f426a9a22886071966432ede8fceafffe12b8c
`f7a22071dbf316c982fb44308874bd7ad9ac2091`	affected	< 94fe0ab01b480b52bd8f977edbd845ef375d69fd
`f7a22071dbf316c982fb44308874bd7ad9ac2091`	affected	< 78237e3c0720fcc6eb9b87e90fd70f63eeca886f

Linux

affected

Version	Status	Constraints
`6.10`	affected	—
`0`	unaffected	< 6.10
`6.12.97`	unaffected	≤ 6.12.*
`6.18.40`	unaffected	≤ 6.18.*
`7.1.5`	unaffected	≤ 7.1.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[f7a22071dbf316c982fb44308874bd7ad9ac2091,ee188a6b264b71315a67f1b9470faad308b730d2)`	affected	code_commit	—
`[f7a22071dbf316c982fb44308874bd7ad9ac2091,b2f426a9a22886071966432ede8fceafffe12b8c)`	affected	code_commit	—
`[f7a22071dbf316c982fb44308874bd7ad9ac2091,94fe0ab01b480b52bd8f977edbd845ef375d69fd)`	affected	code_commit	—
`[f7a22071dbf316c982fb44308874bd7ad9ac2091,78237e3c0720fcc6eb9b87e90fd70f63eeca886f)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`6.10`	affected	generic	—
`[0,6.10)`	unaffected	generic	—
`[6.12.97,6.13.0)`	unaffected	generic	—
`[6.18.40,6.19.0)`	unaffected	generic	—
`[7.1.5,7.2.0)`	unaffected	generic	—
`[7.2-rc3,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply the patch that adds the bounds check (commit 78237e3c0720fcc6eb9b87e90fd70f63eeca886f) or install the latest kernel update from your distribution that contains this fix.
Restrict loopback device access by configuring the device permissions or by adding the loop module to an access control list that allows only privileged users.
If the loopback device is not required, unload the loop module (modprobe -r loop) or disable loading by adding it to the modprobe blacklist or configuring the system to use the stub /bin/true as a placeholder.
Continuously monitor vendor advisories and apply any subsequent kernel patches that address loopback‑related issues.

Generated by OpenCVE AI on August 18, 2026 at 01:40 UTC.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00163.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/78237e3c0720fcc6eb9b87e90fd70f63eeca886f
https://git.kernel.org/stable/c/94fe0ab01b480b52bd8f977edbd845ef375d69fd
https://git.kernel.org/stable/c/b2f426a9a22886071966432ede8fceafffe12b8c
https://git.kernel.org/stable/c/ee188a6b264b71315a67f1b9470faad308b730d2
https://lore.kernel.org/linux-cve-announce/2026081509-CVE-2026-72018-ba3f@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-72018
https://www.cve.org/CVERecord?id=CVE-2026-72018

History

Tue, 18 Aug 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-787
References		https://lore.kernel.org/linux-cve-announce/2026081509-CVE-2026-72018-ba3f@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-72018 https://www.cve.org/CVERecord?id=CVE-2026-72018
Metrics	threat_severity `None`	threat_severity `Moderate`

Mon, 17 Aug 2026 22:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-119

Mon, 17 Aug 2026 19:45:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-119

Mon, 17 Aug 2026 06:00:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Sat, 15 Aug 2026 22:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-119

Sat, 15 Aug 2026 06:00:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: dibs: loopback: validate offset and size in move_data() The loopback move_data() performs a memcpy into the registered DMB without checking whether offset + size exceeds the DMB length. Unlike real ISM hardware, which enforces memory region bounds natively, the software loopback has no such protection. A peer-supplied out-of-bounds offset or oversized write would result in an OOB write past the allocated kernel buffer. Add an explicit bounds check before the memcpy to reject such requests with -EINVAL.
Title		dibs: loopback: validate offset and size in move_data()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/78237e3c0720fcc6eb9b87e90fd70f63eeca886f https://git.kernel.org/stable/c/94fe0ab01b480b52bd8f977edbd845ef375d69fd https://git.kernel.org/stable/c/b2f426a9a22886071966432ede8fceafffe12b8c https://git.kernel.org/stable/c/ee188a6b264b71315a67f1b9470faad308b730d2

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-15T05:51:45.360Z

Updated: 2026-08-17T05:39:27.125Z

Reserved: 2026-08-09T03:40:39.900Z

Link: CVE-2026-72018

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-08-15T06:21:00.670

Modified: 2026-08-17T06:17:59.313

Link: CVE-2026-72018

Redhat

Severity : Moderate

Publid Date: 2026-08-15T00:00:00Z

Links: CVE-2026-72018 - Bugzilla

OpenCVE Enrichment

Updated: 2026-08-18T01:45:05Z

Weaknesses

CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787
Out-of-bounds Write

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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