dibs: loopback: validate offset and size in move_data() (CVE-2026-72018) | HOL Guard CVE

High · CVSS 7.8CVE-2026-72018

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

Answer in brief

CVE-2026-72018 records a High severity (CVSS 7.8) vulnerability in dibs: loopback: validate offset and size in move_data(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=f7a22071dbf316c982fb44308874bd7ad9ac2091 <ee188a6b264b71315a67f1b9470faad308b730d2 \|\| >=f7a22071dbf316c982fb44308874bd7ad9ac2091 <b2f426a9a22886071966432ede8fceafffe12b8c \|\| >=f7a22071dbf316c982fb44308874bd7ad9ac2091 <94fe0ab01b480b52bd8f977edbd845ef375d69fd \|\| >=f7a22071dbf316c982fb44308874bd7ad9ac2091 <78237e3c0720fcc6eb9b87e90fd70f63eeca886f	ee188a6b264b71315a67f1b9470faad308b730d2, b2f426a9a22886071966432ede8fceafffe12b8c, 94fe0ab01b480b52bd8f977edbd845ef375d69fd, 78237e3c0720fcc6eb9b87e90fd70f63eeca886f
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ee188a6b264b71315a67f1b9470faad308b730d2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.