CVE-2025-71313

What the bug is

alloc_workqueue() can return NULL on memory allocation failure. Without proper error checking, this may lead to a NULL pointer dereference when queue_work() is later called with the NULL workqueue pointer in epf_ntb_epc_init(). Add a NULL check immediately after alloc_workqueue() and return -ENOMEM on failure to prevent the driver from loading with an invalid workqueue pointer.

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/pci/endpoint/functions/pci-epf-ntb.c
drivers/pci/endpoint/functions/pci-epf-vntb.c

What this is

NTB DRIVER COREMAINTAINERS section matched on drivers/pci/endpoint/functions/pci-epf-*ntb.c · ntb@lists.linux.dev · Supported

Kernel module

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

Check it on the machine

grep -wE 'CONFIG_PCI_ENDPOINT|CONFIG_PCI_EPF_NTB' /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_PCI_ENDPOINT, CONFIG_PCI_EPF_NTB

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

2026-06-03 (5 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.12%, higher than 1.7% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/pci

Upstream fixes

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

Introduced	Fixed in	Commit
5.12	6.18.57	2f62f8be5788
5.12	6.19.4	314eab6740bc
5.12	7.0	03f336a869b3