CVE-2026-72058

What the bug is

ixp4xx_hss_probe() allocates two HDLC netdevs. The first one is stored in ndev, initialized, and registered with register_hdlc_device(). The second one is stored in port->netdev and later used by the remove path for unregister_hdlc_device() and free_netdev(). This means that the registered netdev is not the same object that is unregistered and freed on remove. It also leaks the first allocation if the second alloc_hdlcdev() call fails, and the first allocation is not checked before ndev is used. Older code allocated the HDLC netdev only once and stored the same object in both the local variable and port->netdev. The buggy conversion split this into two alloc_hdlcdev() calls. A later rename changed the local variable name to ndev, but the underlying mismatch remained. Fix this by allocating the HDLC netdev only once and assigning the same object to port->netdev.

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/net/wan/ixp4xx_hss.c

What this is

ARM/INTEL IXP4XX ARM ARCHITECTUREMAINTAINERS section matched on drivers/net/wan/ixp4xx_hss.c · linux-arm-kernel@lists.infradead.org · Maintained

Kernel module

none to look for. The file would have gone into ixp4xx_hss, and Debian does not compile it into that module, so finding ixp4xx_hss in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_IXP4XX_HSS|CONFIG_WAN' /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 4 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, sidn

n

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

Build switches

CONFIG_IXP4XX_HSS, CONFIG_WAN

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

2026-08-15 (2 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.21%, higher than 11.0% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/net

Upstream fixes

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

Introduced	Fixed in	Commit
5.14	5.15.217	77d925b948ee
5.14	6.1.178	8f4c3c384092
5.14	6.6.145	fd0b939ebd1e
5.14	6.12.97	ffba16e6f559
5.14	6.18.40	3f85fcd520aa
5.14	7.1.5	91850f582783
5.14	7.2	db818b0e8af7