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Vulnerability · Published Oct 23, 2026 · Assigned by Linux

CVE-2026-99022regulator: ltc3676: don't read the write-only HRST and CLIRQ registers

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 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 92.7% 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: regulator: ltc3676: don't read the write-only HRST and CLIRQ registers HRST (0x1e) and CLIRQ (0x1f) are write-only command strobes. Writing HRST triggers a hard reset of the chip and writing CLIRQ clears the interrupt; reading them returns nothing useful, and the read itself fires the command. The result is that a plain register dump resets the board: cat /sys/kernel/debug/regmap/2-003c/registers walks every readable register, hits HRST, and the board reboots. Split the callback back in two so HRST and CLIRQ stay writable but are no longer readable. The readable range is left unchanged (LTC3676_BUCK1 ... LTC3676_IRQSTAT).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-99022
Debian:13linux6.12.113-1DEBIAN-CVE-2026-99022
Debian:14linux7.2.11-1DEBIAN-CVE-2026-99022
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux7.3.0-10.10UBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-aws7.3.0-1004.4UBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-azureno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-gcp7.3.0-1004.4UBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-oracle7.3.0-1004.4UBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-raspi7.3.0-1004.4UBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-realtime7.3.0-10.10.1UBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99022
Ubuntu:26.10linux-riscv7.3.0-10.10.1UBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-99022
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-99022
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-99022

Affected products (as reported)

VendorProductVersions
Linux Linux 37b918a034feda1b1ef404acf003812f37ab8da2 – before 4cc1e849bb7dd8deb37f6a51e1aaf725e201659537b918a034feda1b1ef404acf003812f37ab8da2 – before 0893de2397d85547d4b88379044aa541b07b56af37b918a034feda1b1ef404acf003812f37ab8da2 – before f8b0ccdcf3ca7cf6e4c2c400e80f81a727f768c737b918a034feda1b1ef404acf003812f37ab8da2 – before fd376d83741118e0212f0da985889c1a98d9c82737b918a034feda1b1ef404acf003812f37ab8da2 – before 1fb0d58fd363b439b4faf08a16ee6ae38b575cd437b918a034feda1b1ef404acf003812f37ab8da2 – before 199a62d70314d21f06a9a6faaa3ef54d0404910c37b918a034feda1b1ef404acf003812f37ab8da2 – before ca5d85335a8fa6e87b45629f1a07b412482cab1737b918a034feda1b1ef404acf003812f37ab8da2 – before 28c2388ee24cdbefbcc458fa41ef7bffaaa1cc83
Linux Linux 4.9

References