Bluetooth: ISO: fix malformed ISO_END/CONT handling (CVE-2026-72334) | HOL Guard CVE

High · CVSS 8.8CVE-2026-72334

Bluetooth: ISO: fix malformed ISO_END/CONT handling

Answer in brief

CVE-2026-72334 records a High severity (CVSS 8.8) vulnerability in Bluetooth: ISO: fix malformed ISO_END/CONT handling. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 Sep 21, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Sep 21, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 3 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=ccf74f2390d60a2f9a75ef496d2564abb478f46a <990e65eb9387c4ddfa7f68782b6644c2c35d489f \|\| >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <e054c1a6ae7310d2815778fddb87da616e11c255	990e65eb9387c4ddfa7f68782b6644c2c35d489f, e054c1a6ae7310d2815778fddb87da616e11c255
Linux/Linuxgeneric	6.0	Not reported
Linux/Linuxgeneric	>=ccf74f2390d60a2f9a75ef496d2564abb478f46a <49aeb54e3c912ef785311264a51ab9f3698e421b \|\| >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <5e53e285f8c989662e34d4938c728a94226bff34 \|\| >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <990e65eb9387c4ddfa7f68782b6644c2c35d489f \|\| >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <e054c1a6ae7310d2815778fddb87da616e11c255	49aeb54e3c912ef785311264a51ab9f3698e421b, 5e53e285f8c989662e34d4938c728a94226bff34, 990e65eb9387c4ddfa7f68782b6644c2c35d489f, e054c1a6ae7310d2815778fddb87da616e11c255

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 990e65eb9387c4ddfa7f68782b6644c2c35d489f; Linux/Linux to 49aeb54e3c912ef785311264a51ab9f3698e421b 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
Sep 21, 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: fix malformed ISO_END/CONT handling Core specification (Part C vol 4 sec 5.4.5) does not exclude empty ISO_CONT, ISO_END packets. We currently reject them if they are last. If controller sends malformed sequence ISO_START -> rx_len = 4, ISO_CONT skb->len 4, ISO_START that ends payload in ISO_CONT, we leak conn->rx_skb. If controller sends too long ISO_END, we panic on skb_put. If controller sends too short ISO_END we accept it. Fix by marking unfinished ISO_START via conn->rx_skb != NULL. Check skb->len properly before skb_put. Combine the ISO_CONT/END code paths as they require the same initial checks. Reject too short ISO_END packets.

Quoted source text, attributed separately from HOL analysis.