ReviewHigh

CVE-2026-74534

Linux

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix refcounting of iso_conn iso_conn_del() and iso_chan_del() have a race that results to double-put of iso_conn: [Task hdev->workqueue] [Task 2] iso_conn_del iso_chan_del iso_conn_hold_unless_zero iso_conn_lock iso_conn_lock conn->sk = NULL iso_conn_unlock sk = iso_sock_hold(conn) <---------´ if (!sk) iso_conn_put iso_conn_put iso_conn_put /* UAF */ The extra put for !sk in iso_conn_del() is currently required since failing iso_chan_add() may leave iso_conn not associated with any sk. Fix by having iso_pi(s...

CVSS: 8.8
EPSS: -
CISA KEV: Not listed
Published: 2026.08.15

PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= dc26097bdb864a0d5955b9a25e43376ffc1af99b < 3b921533e8aa95b77aadcf31737595578e735f3c, >= dc26097bdb864a0d5955b9a25e43376ffc1af99b < 8208b4939afb0a1977fffe902c3ca42fe0f3baaa, >= dc26097bdb864a0d5955b9a25e43376ffc1af99b < fdfde532ab1caa165fcd8985001157ac8b4db365, >= f53e7489273dc2bb307bf50f319b3762d45534f0, >= a58d0f5dac322e16cc75334d000666512341bde5, >= 6.11.11 < 6.12, >= 6.12.2 < 6.13, >= 6.13
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: Not available