CVE-2026-72105

Status: UPDATED  |  Advisory ID: CVE-2026-72105

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References