CVE-2026-74459

What the bug is

es58x_read_bulk_callback() resubmits the RX URB after processing a received packet. If the resubmit succeeds, the URB remains anchored and will be handled by the normal RX path or by teardown. However, if usb_submit_urb() fails, the callback unanchors the URB and then returns directly. This skips the existing free_urb path, so the coherent transfer buffer allocated with usb_alloc_coherent() is not released. Reuse the existing free_urb path after a resubmit failure so that the RX coherent buffer is freed before leaving the callback.

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/can/usb/etas_es58x/es58x_core.c

What this is

ETAS ES58X CAN/USB DRIVERMAINTAINERS section matched on drivers/net/can/usb/etas_es58x/ · linux-can@vger.kernel.org · Maintained

Kernel module

none to look for. The file would have gone into etas_es58x, and Debian does not compile it into that module, so finding etas_es58x in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_CAN|CONFIG_CAN_ETAS_ES58X' /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_CAN, CONFIG_CAN_ETAS_ES58X

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
5.15.203	5.15.216	c7ddf119544e
6.1.167	6.1.183	21da1a374769
6.6.130	6.6.151	0ef136ba0521
6.12.77	6.12.103	b85e5c310382
6.18.17	6.18.44	c311f17c261f
7.0	7.1.8	19c6c8c6cd5d
7.0	7.2	7a0cf2b2497c
6.19.7	0	0

Debian advisories