CVE-2026-72026: irqchip/irq-riscv-imsic-early: Fix fwnode leak on state setup failure

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

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

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

irqchip/irq-riscv-imsic-early: Fix fwnode leak on state setup failure

imsic_early_acpi_init() allocates a firmware node before setting up the
IMSIC state. If imsic_setup_state() fails, the function returns without
freeing the allocated fwnode.

Free the fwnode and clear the global pointer on this error path, matching
the cleanup already done when imsic_early_probe() fails.

[ tglx: Use a common cleanup path instead of copying code around ]

The Linux kernel CVE team has assigned CVE-2026-72026 to this issue.


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

	Issue introduced in 6.12 with commit fbe826b1c10699a70b81a441fe47b817d1019f37 and fixed in 6.12.97 with commit a27f17bad38c5fea3c73281517869af0089a0451
	Issue introduced in 6.12 with commit fbe826b1c10699a70b81a441fe47b817d1019f37 and fixed in 6.18.40 with commit a5a367756926de1c21a013ea5ed7fc2219f4cb4f
	Issue introduced in 6.12 with commit fbe826b1c10699a70b81a441fe47b817d1019f37 and fixed in 7.1.5 with commit b321a046d7717225c07ba3f4b7b0a4758c2f9d58
	Issue introduced in 6.12 with commit fbe826b1c10699a70b81a441fe47b817d1019f37 and fixed in 7.2-rc2 with commit 1358126fbed104e5657955d3ba029b283687ba02

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-2026-72026
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/irqchip/irq-riscv-imsic-early.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/a27f17bad38c5fea3c73281517869af0089a0451
	https://git.kernel.org/stable/c/a5a367756926de1c21a013ea5ed7fc2219f4cb4f
	https://git.kernel.org/stable/c/b321a046d7717225c07ba3f4b7b0a4758c2f9d58
	https://git.kernel.org/stable/c/1358126fbed104e5657955d3ba029b283687ba02