VulnerabilityPublished 23 Oct 2026

CVE-2026-98935: Linux kernel · rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak

Source GCVE Database

Authoritative record:CVE-2026-98935

Not known to be exploited · fixed in beda3c9730ad3087d01aa1d0415c40942042ec87 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in beda3c9730ad3087d01aa1d0415c40942042ec87, a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb, 2838d7bbb551861c25187dfb581ed6e7a56762e9 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-p9j5-gjf3-cch6

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62, < beda3c9730ad3087d01aa1d0415c40942042ec87	Fixed in beda3c9730ad3087d01aa1d0415c40942042ec87
LinuxLinux	Affected ≥ 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62, < a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb	Fixed in a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb
LinuxLinux	Affected ≥ 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62, < 2838d7bbb551861c25187dfb581ed6e7a56762e9	Fixed in 2838d7bbb551861c25187dfb581ed6e7a56762e9
LinuxLinux	Affected ≥ 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62, < 0ee5c5d804d592a8328a425b9274487d393d3a05	Fixed in 0ee5c5d804d592a8328a425b9274487d393d3a05
LinuxLinux	Affected ≥ 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62, < 00dc50cede96738dadc64b20e671186cddb8a58d	Fixed in 00dc50cede96738dadc64b20e671186cddb8a58d
LinuxLinux	Affected =5.0	Fixed in–

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')

References

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