CVE-2025-21724 - Linux kernel: iommufd/iova_bitmap UBSAN Shift Out-of-Bounds

CVE-2025-21724 - Linux kernel: iommufd/iova_bitmap UBSAN Shift Out-of-Bounds

https://cvefeed.io/rssfeed/latest.atom / Thu, 02/27/2025 - 03:47
CVE ID : CVE-2025-21724
Published : Feb. 27, 2025, 2:15 a.m. | 32 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index() Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index() where shifting the constant "1" (of type int) by bitmap->mapped.pgshift (an unsigned long value) could result in undefined behavior. The constant "1" defaults to a 32-bit "int", and when "pgshift" exceeds 31 (e.g., pgshift = 63) the shift operation overflows, as the result cannot be represented in a 32-bit type. To resolve this, the constant is updated to "1UL", promoting it to an unsigned long type to match the operand's type.
Severity: 0.0 | NA
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