CVE-2026-98935
Published Oct 23, 2026
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')
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References
Other References
https://git.kernel.org/stable/c/00dc50cede96738dadc64b20e671186cddb8a58d
https://git.kernel.org/stable/c/0ee5c5d804d592a8328a425b9274487d393d3a05
https://git.kernel.org/stable/c/2838d7bbb551861c25187dfb581ed6e7a56762e9
https://git.kernel.org/stable/c/a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb
https://git.kernel.org/stable/c/beda3c9730ad3087d01aa1d0415c40942042ec87
Frequently Asked Questions
What is CVE-2026-98935? +
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')
How do I check if I'm vulnerable to CVE-2026-98935? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.