CVE-2026-89964

What the bug is

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.

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

drivers/parisc/eisa.c

What this is

PARISC ARCHITECTUREMAINTAINERS section matched on drivers/parisc/ · linux-parisc@vger.kernel.org · Maintained

Kernel module

none to look for. The file would have gone into eisa, and Debian does not compile it into that module, so finding eisa in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_EISA|CONFIG_PARISC' /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sid, bookworm · linux-6.12n

n

not enabled on any flavour - this release does not build the code

Build switches

CONFIG_EISA, CONFIG_PARISC

Reads as

all on means the file is compiled; any one off means it is not.

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-09-16 (33 days ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.21%, higher than 10.6% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/parisc

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
2.6.12	5.10.270	68659b627770
2.6.12	5.15.221	8640ade22369
2.6.12	6.1.188	21f063e3c2b1
2.6.12	6.6.157	62d88e93ef5e
2.6.12	6.12.110	bb10d54b7484
2.6.12	6.18.51	3e2691eeee83
2.6.12	7.2.5	16a62a3f2128
2.6.12	7.3	8b585431a16c

Debian advisories