CVE-2026-74534
HighIn 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(sk)->conn own refcount when non-NULL, so iso_conn_del does not need to put it. Adjust the iso_conn_add() refcounting so that conn is put if it does not get associated with an sk.
CVSS 3.1 score
8.8
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected versions
Linux kernel versions
6.11.11,
6.12.2,
6.13
and later are affected. Fixed in
6.18.44,
7.1.8,
7.2
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-74534?
CVE-2026-74534 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 . It affects Linux kernel versions from 6.11.11 onward and has been patched in 6.18.44, 7.1.8 and 7.2. CVE-2026-74534 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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What is the CVSS score for CVE-2026-74534?
CVE-2026-74534 has a CVSS score of 8.8 out of 10, rated High severity (CVSS 3.1). The vector string is
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. -
Is there a patch available for CVE-2026-74534?
Yes. CVE-2026-74534 has been patched. Fixed versions include 6.18.44, 7.1.8 and 7.2. If you are running Linux kernel 6.11.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74534 actively exploited?
No. CVE-2026-74534 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.