CVE-2026-89964: parisc: eisa: Fix infinite loop when parsing invalid IRQ value

CVE-2026-89964: parisc: eisa: Fix infinite loop when parsing invalid IRQ value

[Greg Kroah-Hartman]

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

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

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

parisc: eisa: Fix infinite loop when parsing invalid IRQ value

When an invalid value is passed via the "eisa_irq_edge=" kernel
command line parameter (e.g. "eisa_irq_edge=16,5"), eisa_irq_setup()
prints an error message and continues without advancing the current
position.  As a result the same invalid value is parsed again and
again, causing an infinite loop while the kernel boots.

Advance to the next comma-separated entry, or stop parsing when there
is no next entry, before continuing so that the remaining entries are
processed normally.

The Linux kernel CVE team has assigned CVE-2026-89964 to this issue.


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

	Fixed in 5.10.270 with commit 68659b627770f3c8d8f578e8ddee78a07d5f1d0e
	Fixed in 5.15.221 with commit 8640ade22369e248f77fbdd31a9d71b338499eef
	Fixed in 6.1.188 with commit 21f063e3c2b11fb9078ccdfd3b23634313ce4f0c
	Fixed in 6.6.157 with commit 62d88e93ef5e1e04041e347945f7d7510eba1797
	Fixed in 6.12.110 with commit bb10d54b74845eb4547baa1b9e908ecd32aa64e1
	Fixed in 6.18.51 with commit 3e2691eeee83a819125dba3f42c74e1b6730d5cd
	Fixed in 7.2.5 with commit 16a62a3f2128b3d86fefc082d8f631becd02bff5
	Fixed in 7.3-rc1 with commit 8b585431a16cfb9d8f2955a9fa0787ce3dceb3c2

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-2026-89964
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/parisc/eisa.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/68659b627770f3c8d8f578e8ddee78a07d5f1d0e
	https://git.kernel.org/stable/c/8640ade22369e248f77fbdd31a9d71b338499eef
	https://git.kernel.org/stable/c/21f063e3c2b11fb9078ccdfd3b23634313ce4f0c
	https://git.kernel.org/stable/c/62d88e93ef5e1e04041e347945f7d7510eba1797
	https://git.kernel.org/stable/c/bb10d54b74845eb4547baa1b9e908ecd32aa64e1
	https://git.kernel.org/stable/c/3e2691eeee83a819125dba3f42c74e1b6730d5cd
	https://git.kernel.org/stable/c/16a62a3f2128b3d86fefc082d8f631becd02bff5
	https://git.kernel.org/stable/c/8b585431a16cfb9d8f2955a9fa0787ce3dceb3c2