In the Linux kernel, the following vulnerability has been resolved: pinctrl: meson: amlogic-a4: fix deadlock issue Accessing the pinconf-pins sysfs node may deadlock. pinconf_pins_show() holds pctldev->mutex, and the platform driver calls pinctrl_find_gpio_range_from_pin(), which tries to acquire the same mutex again, leading to a deadlock. Use pinctrl_find_gpio_range_from_pin_nolock() to fix this issue.

A flaw was found in the Linux kernel's pinctrl subsystem for Amlogic A4 devices. A local attacker could trigger a deadlock by accessing the `pinconf-pins` sysfs node. This occurs because the `pinconf_pins_show()` function attempts to acquire a mutex that is already held, leading to a system freeze or unresponsiveness. This vulnerability can result in a denial of service.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-64521 https://nvd.nist.gov/vuln/detail/CVE-2026-64521 https://lore.kernel.org/linux-cve-announce/2026072538-CVE-2026-64521-9fe3@gregkh/T