Bluetooth: ISO: clear iso_data always when detaching conn from hcon (CVE-2026-74541) | HOL Guard CVE

High · CVSS 8.8CVE-2026-74541

Bluetooth: ISO: clear iso_data always when detaching conn from hcon

Answer in brief

CVE-2026-74541 records a High severity (CVSS 8.8) vulnerability in Bluetooth: ISO: clear iso_data always when detaching conn from hcon. 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	>=fbdc4bc47268953c80853489f696e02d61f9a2c6 <cc1d39946d62bc568551dfb81149724de1e91338 \|\| >=fbdc4bc47268953c80853489f696e02d61f9a2c6 <7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0 \|\| >=fbdc4bc47268953c80853489f696e02d61f9a2c6 <63c0f396a18b767eb28e895eb95bbdce6c172c59 \|\| >=fbdc4bc47268953c80853489f696e02d61f9a2c6 <69a4a7b162b3db6ac337e3094cdee38f24d42ff7 \|\| >=fbdc4bc47268953c80853489f696e02d61f9a2c6 <d57e506f6a1e3929611340fae87c1e4823f4d85c \|\| c03a10bd5b6ccb22921e04bcddc987410df7e7a9 \|\| >=6.5.12 <6.6	cc1d39946d62bc568551dfb81149724de1e91338, 7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0, 63c0f396a18b767eb28e895eb95bbdce6c172c59, 69a4a7b162b3db6ac337e3094cdee38f24d42ff7, d57e506f6a1e3929611340fae87c1e4823f4d85c, 6.6
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to cc1d39946d62bc568551dfb81149724de1e91338 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: ISO: clear iso_data always when detaching conn from hcon When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is necessary, otherwise later iso_conn_free() will UAF. Fix clearing of iso_data in iso_sock_disconn() Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on iso_sock_release() followed by hci_abort_conn_sync().

Quoted source text, attributed separately from HOL analysis.