Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-10-18T00:00:00 kernel: gpio: cdev: fix kernel stack leak to user-space in error path 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CWE-908

In the Linux kernel, the following vulnerability has been resolved: gpio: cdev: fix kernel stack leak to user-space in error path If we fail to acquire the GPIO chip guard in gpio_desc_to_lineinfo(), we return immediately before zeroing the info struct we'll end up passing to the user-space later in lineinfo_get_v1(). This may leak the kernel stack contents. Make gpio_desc_to_lineinfo() return int so that the -ENODEV returned on failure to acquire the guard can be propagated to the callers. While not strictly necessary: move the memset() before trying to acquire the SRCU read lock too for good measure.

A flaw was found in the Linux kernel's GPIO (General Purpose Input/Output) character device interface. This vulnerability allows a local user to cause an information disclosure of sensitive kernel stack data. When an error occurs while querying GPIO line details, the kernel fails to clear the data structure before passing it back to user space, leaking uninitialized kernel memory contents.

This vulnerability is assessed as having a Low impact because exploitation is restricted to authenticated local users who have access to GPIO character device nodes, and the defect only exposes uninitialized kernel stack memory without enabling privilege escalation or system crashes. In standard enterprise deployments, GPIO controllers are rarely present and access to corresponding device interfaces is limited to privileged accounts by default. Furthermore, Red Hat Enterprise Linux versions 8 and 9 are unaffected as they do not contain the vulnerable code path. Red Hat Enterprise Linux 10 Fix deferred 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 Red Hat OpenShift Container Platform 4 Not affected openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 4 Not affected openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 Not affected openshift/ose-rhel-coreos-9 https://www.cve.org/CVERecord?id=CVE-2026-98528 https://nvd.nist.gov/vuln/detail/CVE-2026-98528 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98528.mbox