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Vulnerability · Published May 6, 2026 · Assigned by Linux

CVE-2026-43220iommu/amd: serialize sequence allocation under concurrent TLB invalidations

Medium 5.5

In plain English

A medium-severity 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 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 97.6% 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: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.12.88-1DEBIAN-CVE-2026-43220
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-43220
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-43220
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-43220
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-43220

Affected products (as reported)

VendorProductVersions
Linux Linux f2f65b28d802a667119147444ec2ae33eebf9a58 – before d51bf43193b1e95dc4e34e540dc76e19def2ae5a715c263119fd1b918a9fcbd8a36ea5b604a46324 – before fca7aa0264ae99e5ff287d0ced5af0b82b121c4fe15768e68820142077bbca402d8e902f64ade1b0 – before 5000ce7fcb31067566a1a1a2e5b5bbff93625242496269d12072ecb219826485bdbec70c92a8eef5 – before 48caa7542a795c9679ec1bd1bc2592e05a7369a4d2a0cac10597068567d336e85fa3cbdbe8ca62bf – before 9e249c48412828e807afddc21527eb734dc9bd3d69d9339c02eddfc2a345be7220651068a36843836.1.191 – before 6.2
Linux Linux 6.6.128 – before 6.6.1406.12.75 – before 6.12.88

References