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().
Published: 2026-08-15
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The bug manifests when detaching a Bluetooth ISO connection; the iso_data pointer is not cleared, causing iso_conn_free to dereference freed memory. Based on the description, it is inferred that an attacker with local control of the Bluetooth stack or with sufficient privileges could trigger this sequence of detach events, potentially leading to kernel memory corruption, privilege escalation, or denial of service due to the use‑after‑free flaw.

Affected Systems

This issue affects the Linux kernel’s Bluetooth ISO implementation. No specific kernel release numbers are listed in the data, so any kernel build that has not applied the patch will be vulnerable.

Risk and Exploitability

The condition is a kernel‑level use‑after‑free that could allow an attacker with access to the Bluetooth driver to crash the system or execute arbitrary code. The CVSS score of 8.8 indicates high severity. The EPSS score is <1%, indicating a very low probability of exploitation, and the issue is not listed in KEV. As the attack vector is inferred to be through manipulation of ISO connection detachment, the exploit would likely require local or privileged access to the Bluetooth subsystem rather than a remote surface.

Generated by OpenCVE AI on August 21, 2026 at 19:28 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the kernel update that contains the ISO data clearing change, specifically addressing the use‑after‑free flaw identified as CWE‑416.
  • If a kernel upgrade is not possible, disable all Bluetooth ISO connections or stop the Bluetooth service to eliminate the attack surface associated with CWE‑416.
  • Continuously monitor system logs for KASAN reports or kernel panics involving ISO socket release; such indicators confirm exploitation attempts related to CWE‑416 and prompt patch deployment when available.

Generated by OpenCVE AI on August 21, 2026 at 19:28 UTC.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
Debian DSA Debian DSA DSA-6466-1 linux security update
History

Thu, 20 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 17 Aug 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Mon, 17 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

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

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Sat, 15 Aug 2026 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sat, 15 Aug 2026 12:45:00 +0000

Type Values Removed Values Added
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().
Title Bluetooth: ISO: clear iso_data always when detaching conn from hcon
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-17T05:48:29.921Z

Reserved: 2026-08-15T05:44:03.914Z

Link: CVE-2026-74541

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T13:17:59.443

Modified: 2026-08-17T06:19:51.297

Link: CVE-2026-74541

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-74541 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-21T19:30:05Z

Weaknesses