CVE-2026-64318

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the aix partition() function where the system reads a physical volume descriptor into a fixed-size struct pvd and scans its physical-partition-extent array. The loop controlling this scan uses the pp count variable, which is an unvalidated value read directly from the descriptor. If a crafted AIX image is provided with a pp count exceeding 1016, the loop reads the pvd->ppe[i] array beyond its allocated memory boundary, potentially accessing up to 2 MB of out-of-bounds data. This process occurs during partition scanning when a block device with a malicious AIX/IBM partition table is detected, such as through losetup -P or udev auto-scanning, via the msdos partition() function calling aix partition().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.