CVE-2026-72101: dm-integrity: fix leaking uninitialized kernel memory

From: Greg Kroah-Hartman <[email protected]>

Description
===========

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

dm-integrity: fix leaking uninitialized kernel memory

If hash size is less than device's tuple size, dm-integrity is supposed
to zero the remaining space. There was a bug in the code that zeroing
didn't work. This commit fixes it.

The Linux kernel CVE team has assigned CVE-2026-72101 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.11 with commit fb0987682c629c1d2c476f35f6fde405a5e304a4 and fixed in 6.12.101 with commit 50af3e51dc709384701dbc721b4bd865285c5f2c
	Issue introduced in 6.11 with commit fb0987682c629c1d2c476f35f6fde405a5e304a4 and fixed in 6.18.40 with commit 0c4e9bb1d4101030f55c869f18bd3ece39a77bbb
	Issue introduced in 6.11 with commit fb0987682c629c1d2c476f35f6fde405a5e304a4 and fixed in 7.1.5 with commit 8f0af8493009a61b4313e0a8c6e03fbc36fd43f9
	Issue introduced in 6.11 with commit fb0987682c629c1d2c476f35f6fde405a5e304a4 and fixed in 7.2-rc3 with commit 7bb03b2b01b814a9fc14afbfc2cbb2cca5b34750

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-72101
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/md/dm-integrity.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/50af3e51dc709384701dbc721b4bd865285c5f2c
	https://git.kernel.org/stable/c/0c4e9bb1d4101030f55c869f18bd3ece39a77bbb
	https://git.kernel.org/stable/c/8f0af8493009a61b4313e0a8c6e03fbc36fd43f9
	https://git.kernel.org/stable/c/7bb03b2b01b814a9fc14afbfc2cbb2cca5b34750