CVE-2026-74533 Affecting kernel-source package, versions <6.4.0-150700.53.84.1


Severity

Recommended
high

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.34% (25th percentile)

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  • Snyk IDSNYK-SLES157-KERNELSOURCE-21166454
  • published17 Oct 2026
  • disclosed16 Oct 2026

Introduced: 16 Oct 2026

NewCVE-2026-74533  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 kernel-source to version 6.4.0-150700.53.84.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-source package and not the kernel-source package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero

hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race

[Task hdev-&gt;workqueue]                 	[Task 2]
iso_recv                                    iso_conn_put(conn)
  conn = LOAD hcon-&gt;iso_data                  iso_conn_free(conn)
  iso_conn_hold_unless_zero(conn)               hcon-&gt;iso_data = NULL
                                                kfree(conn)
    kref_get_unless_zero(&amp;conn-&gt;ref) /* UAF */

and also to races in iso_conn_add() vs. iso_conn_free().

Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.

CVSS Base Scores

version 3.1