CVE-2026-98935 rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-98935?
CVE-2026-98935 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
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')
Which versions are affected by CVE-2026-98935?
How do I fix CVE-2026-98935?
Upgrade to a fixed version.
Is CVE-2026-98935 being exploited?
There is no known exploitation of CVE-2026-98935 in the wild and no public exploit code.
Sources
Also known as AZL-110723, BELL-CVE-2026-98935, DEBIAN-CVE-2026-98935, GHSA-p9j5-gjf3-cch6, UBUNTU-CVE-2026-98935.