CVE-2026-98343

What the bug is

When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device.

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/dma/dmaengine.c

What this is

DMA GENERIC OFFLOAD ENGINE SUBSYSTEMMAINTAINERS section matched on drivers/dma/ · dmaengine@vger.kernel.org · Maintained

Check it on the machine

grep -wE 'CONFIG_DMADEVICES|CONFIG_DMA_ENGINE' /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 builds this, but not on every flavour. At least one release below builds the code on some of its kernel flavours and not on others, so the answer depends on the architecture and flavour installed.

• bookwormYnot built on amd64/cloud-amd64, arm64/cloud-arm64, ppc64el/powerpc64le
• trixie, forky, sidYnot built on amd64/cloud-amd64, arm64/cloud-arm64, ppc64el/powerpc64le, ppc64el/powerpc64le-64k, s390x/s390x

Y

built in where it is built at all; some flavours do not build it

Build switches

CONFIG_DMADEVICES, CONFIG_DMA_ENGINE

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

2026-10-06 (13 days ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.18%, higher than 7.5% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/dma

Upstream fixes

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

Introduced	Fixed in	Commit
5.6	5.10.271	b92c50259533
5.6	5.15.222	855187a88bdf
5.6	6.1.189	c9780b601438
5.6	6.6.158	07eb075b60d5
5.6	6.12.112	9319dd64d5cd
5.6	6.18.54	6cf31716b77a
5.6	7.2.8	02bd02c58529
5.6	7.3	e873c74132f0

Debian advisories