CVE-2026-72107

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

dm era: fix out-of-bounds memory access for non-zero start sector

dm-era tracks writes in target-relative blocks, but era_map() calculates

the writeset block before applying the target offset. Tables with a

non-zero start sector can therefore pass an absolute mapped-device block

to metadata_current_marked().

If the absolute block is beyond the current writeset size,

writeset_marked() tests past the end of the in-core bitset. KASAN reports

this as a vmalloc-out-of-bounds access.

Apply the target offset before calculating the era block so writeset

lookups use the target-relative block number.