CVE-2026-53615 util-linux libblkid DOS extended-partition overflow produces invalid partition metadata

util-linux is a random collection of Linux utilities. Before util-linux 2.41.4, parsedosextended in libblkid/src/partitions/dos.c computes an extended-partition start sector with 32-bit addition and does not apply the extended-area bounds checks to the first two EBR entries. A local attacker who...