CVE-2026-98935

About vulnerability

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

rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak

The struct rtc_wkalrm has padding holes after the ‘pending’ member. When returned to userspace via the RTC_WKALRM_RD ioctl, uninitialized kernel stack data residing in these holes may be leaked.

Zero-initialize the struct at declaration to eliminate this information leak risk.

Fixes smatch warnings:

• drivers/rtc/dev.c:392 rtc_dev_ioctl() warn: check that ‘alarm’ doesn’t leak information (struct has a hole after ‘pending’)

Affected product:

AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , Debian 11 ELS , Oracle Linux 7 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 20.04 ELS

Affected packages:

kernel-uek @ 5.4.17 (+6 more)