Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: iommu/msm: Unwind probe state on registration failure msm_iommu_probe() adds its devm-managed IOMMU object to qcom_iommu_devices before adding the IOMMU sysfs device and registering it with the IOMMU core. If iommu_device_sysfs_add() fails, probe returns with the object still on qcom_iommu_devices. The driver core then releases the devm allocation, leaving a dangling list entry that later list walks may dereference. If iommu_device_register() fails, the same dangling list entry remains and the sysfs device is left registered as well. Unwind the sysfs device and global list entry in reverse setup order on the corresponding failure paths.

Affected versions

Linux: 42df43b36163ed7d0ab13992e411093252903273 through before f532401be9312ecd166f616bb74a65b0b4c150fa (git); 42df43b36163ed7d0ab13992e411093252903273 through before 7f7074a886c4a93e3d12076ce60a510a1ebe400c (git); 42df43b36163ed7d0ab13992e411093252903273 through before 535a200220ca2c83bc8bf54bd2cbe045d6ee70c4 (git); 4.11 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.