CVE-2026-72224: nvdimm/btt: Free arenas on btt_init() error paths

CVE-2026-72224: nvdimm/btt: Free arenas on btt_init() error paths

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

nvdimm/btt: Free arenas on btt_init() error paths

The arenas allocated by discover_arenas() or create_arenas() are not
freed on some error paths in btt_init(). This leaks memory when BTT
initialization fails.

Call free_arenas() from the affected error paths to release the
allocations.

[ as: commit message and log edits ]

The Linux kernel CVE team has assigned CVE-2026-72224 to this issue.


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

	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 5.10.261 with commit 9ab5293d9ac3f2c4232220e563d04701f5f44607
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 5.15.212 with commit 68c967e105d50f885e02b0dbdc9211fd5f84bdcd
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 6.1.178 with commit 0b63788093ff6ccfffe6e87de9e08aeeb406599c
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 6.6.145 with commit 5804e6a6912b5a1e47c821777d69191d69a3fe64
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 6.12.97 with commit 52a7e7ece79c4b0f406149e19cd2b4b11a6c19e4
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 6.18.40 with commit f4ca396bdd60b4e0a665b2589bfc4ddbea9bda2b
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 7.1.5 with commit 7e49684d90faa34ff6d5586be658e986d9d475ac
	Issue introduced in 4.2 with commit 5212e11fde4d40fa627668b4f2222d20db488f71 and fixed in 7.2-rc1 with commit 1a6b6442a982d0ca5fb6a1a39b6f6dfd760eda57

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-2026-72224
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/nvdimm/btt.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/9ab5293d9ac3f2c4232220e563d04701f5f44607
	https://git.kernel.org/stable/c/68c967e105d50f885e02b0dbdc9211fd5f84bdcd
	https://git.kernel.org/stable/c/0b63788093ff6ccfffe6e87de9e08aeeb406599c
	https://git.kernel.org/stable/c/5804e6a6912b5a1e47c821777d69191d69a3fe64
	https://git.kernel.org/stable/c/52a7e7ece79c4b0f406149e19cd2b4b11a6c19e4
	https://git.kernel.org/stable/c/f4ca396bdd60b4e0a665b2589bfc4ddbea9bda2b
	https://git.kernel.org/stable/c/7e49684d90faa34ff6d5586be658e986d9d475ac
	https://git.kernel.org/stable/c/1a6b6442a982d0ca5fb6a1a39b6f6dfd760eda57