CVE-2026-72105: Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: dm-log: fix a bitset_size overflow on 32bit machines Commit c20e36b7631d ("dm log: fix out-of-bounds write due to region_count overflow") made sure that region_count could fit in an unsigned int. But the bitmap memory isn't allocated based on region_count. It uses bitset_size (a size_t variable). The first step of calculating bitset_size is to set it to region_count, rounded up to a multiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG smaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit architecture, this will make bitset_size wrap around to 0 and fail, despite region_count being valid. Since bitset_size gets divided by 8, it can hold any valid region_count. It just needs a special case to handle the rollover. If it is 0, the value rolled over, and bitset size should be set to the number of bytes needed to hold 2^32 bits.

Affected products

• Linux Linux: from 5.10.258, before 5.10.261 (fixed in 5.10.261); from 5.15.209, before 5.15.212 (fixed in 5.15.212); from 6.1.175, before 6.1.178 (fixed in 6.1.178); from 6.6.141, before 6.6.145 (fixed in 6.6.145); from 6.12.91, before 6.12.97 (fixed in 6.12.97); from 6.18.33, before 6.18.40 (fixed in 6.18.40); …

Published 2026-08-15. Last modified 2026-08-17.