Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback (CVE-2026-74530) | HOL Guard CVE

High · CVSS 8.8CVE-2026-74530

Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback

Answer in brief

CVE-2026-74530 records a High severity (CVSS 8.8) vulnerability in Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback. 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 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. 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	>=024421cf39923927ab2b5fe895d1d922b9abe67f <2d91e6244b69d752503b2d44020d8b0e323dbd38 \|\| >=024421cf39923927ab2b5fe895d1d922b9abe67f <56e78b670356caab0b607e8aad4cf819a1909d07 \|\| 620810ac1f7f1133a9ac403e132b3ad6995ddf39 \|\| ee0586ad64a805eaf1a9a10100e908627a561e34 \|\| >=6.12.28 <6.13 \|\| >=6.14.6 <6.15	2d91e6244b69d752503b2d44020d8b0e323dbd38, 56e78b670356caab0b607e8aad4cf819a1909d07, 6.13, 6.15
Linux/Linuxgeneric	6.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 2d91e6244b69d752503b2d44020d8b0e323dbd38 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: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior.

Quoted source text, attributed separately from HOL analysis.