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Vulnerable Software

Vulnerability Details CVE-2026-43220

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 7.9%

CVSS Severity

CVSS v3 Score 5.5

References

Products affected by CVE-2026-43220

Linux » Linux Kernel » Version: 6.12.75

cpe:2.3:o:linux:linux_kernel:6.12.75
Linux » Linux Kernel » Version: 6.12.77

cpe:2.3:o:linux:linux_kernel:6.12.77
Linux » Linux Kernel » Version: 6.12.78

cpe:2.3:o:linux:linux_kernel:6.12.78
Linux » Linux Kernel » Version: 6.12.80

cpe:2.3:o:linux:linux_kernel:6.12.80
Linux » Linux Kernel » Version: 6.12.81

cpe:2.3:o:linux:linux_kernel:6.12.81
Linux » Linux Kernel » Version: 6.12.82

cpe:2.3:o:linux:linux_kernel:6.12.82
Linux » Linux Kernel » Version: 6.12.83

cpe:2.3:o:linux:linux_kernel:6.12.83
Linux » Linux Kernel » Version: 6.12.84

cpe:2.3:o:linux:linux_kernel:6.12.84
Linux » Linux Kernel » Version: 6.12.85

cpe:2.3:o:linux:linux_kernel:6.12.85
Linux » Linux Kernel » Version: 6.12.86

cpe:2.3:o:linux:linux_kernel:6.12.86
Linux » Linux Kernel » Version: 6.12.87

cpe:2.3:o:linux:linux_kernel:6.12.87
Linux » Linux Kernel » Version: 6.12.88

cpe:2.3:o:linux:linux_kernel:6.12.88
Linux » Linux Kernel » Version: 6.12.91

cpe:2.3:o:linux:linux_kernel:6.12.91
Linux » Linux Kernel » Version: 6.6.128

cpe:2.3:o:linux:linux_kernel:6.6.128
Linux » Linux Kernel » Version: 6.6.129

cpe:2.3:o:linux:linux_kernel:6.6.129
Linux » Linux Kernel » Version: 6.6.130

cpe:2.3:o:linux:linux_kernel:6.6.130
Linux » Linux Kernel » Version: 6.6.131

cpe:2.3:o:linux:linux_kernel:6.6.131
Linux » Linux Kernel » Version: 6.6.134

cpe:2.3:o:linux:linux_kernel:6.6.134
Linux » Linux Kernel » Version: 6.6.135

cpe:2.3:o:linux:linux_kernel:6.6.135
Linux » Linux Kernel » Version: 6.6.136

cpe:2.3:o:linux:linux_kernel:6.6.136
Linux » Linux Kernel » Version: 6.6.137

cpe:2.3:o:linux:linux_kernel:6.6.137
Linux » Linux Kernel » Version: 6.6.138

cpe:2.3:o:linux:linux_kernel:6.6.138
Linux » Linux Kernel » Version: 6.6.140

cpe:2.3:o:linux:linux_kernel:6.6.140
Linux » Linux Kernel » Version: 6.6.141

cpe:2.3:o:linux:linux_kernel:6.6.141

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Vulnerability Details CVE-2026-43220

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