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Vulnerability · Published Oct 23, 2026 · Assigned by Linux

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

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 88.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

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')

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-98935
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98935
Debian:14linux7.2.10-1DEBIAN-CVE-2026-98935
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98935
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98935
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98935
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98935

Affected products (as reported)

VendorProductVersions
Linux Linux 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 – before f84eb9b7b0feeb267a174237d70a857042ce015836e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 – before a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 – before beda3c9730ad3087d01aa1d0415c40942042ec8736e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 – before 00dc50cede96738dadc64b20e671186cddb8a58d36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 – before 2838d7bbb551861c25187dfb581ed6e7a56762e936e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 – before 0ee5c5d804d592a8328a425b9274487d393d3a05
Linux Linux 5.0

References