CVE-2026-74355

Summary

In the Linux kernel, the following vulnerability has been resolved:

iommu/vt-d: Fix RB-tree corruption in probe error path

The info->node RB-tree member is zero-initialized via kzalloc. If a device does not support ATS, the device_rbtree_insert() call is skipped. If a subsequent probe step fails, the error path jumps to device_rbtree_remove(), which misinterprets the zeroed node as a tree root and corrupts the device RB-tree.

Fix this by explicitly initializing the RB-node as empty using RB_CLEAR_NODE() during initialization and guarding the removal with RB_EMPTY_NODE().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4f1492efb495bcef34c9ee8a94af81e6cea5abf4 < f5102e0fc3c6dc8685549891a96e4589fdb3e211affected
LinuxLinux4f1492efb495bcef34c9ee8a94af81e6cea5abf4 < d16923a45d4d08367650fdc3451c89299ab6ac5aaffected
LinuxLinux4f1492efb495bcef34c9ee8a94af81e6cea5abf4 < 43bd9e6d5513cb1edbafdeef146a1edc3aaced56affected
LinuxLinux6.15affected
LinuxLinux0 < 6.15unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References