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CVE-2025-71188
dmaengine: lpc18xx-dmamux: fix device leak on route allocation
Published 2026-01-31 (9 months ago) by the Linux kernel CNA. Subsystem drivers/dma. Debian urgency: not yet assigned.
Debian does not build this code. The per-release build detail is under "Where it lives" below.
What to do, per Debian release
Debian's own status for CVE-2025-71188 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source
| Release | Status | Version | What this means |
|---|---|---|---|
| Debian 12bookworm | won't fix | 6.1.190-1 | Debian has decided against an update for bookworm: Arm v7-M not a supported architecture. Moving to a newer release is the way to get the fix. |
| Debian 13trixie | won't fix | 6.12.113-1 | Debian has decided against an update for trixie: Arm v7-M not a supported architecture. Moving to a newer release is the way to get the fix. |
| Debian 14forky | fixed | 6.18.8-1 | Update the kernel and reboot. Fixed in 6.18.8-1. A running kernel keeps the old code until the machine restarts. |
| Debian unstablesid | fixed | 6.18.8-1 | Update the kernel and reboot. Fixed in 6.18.8-1. A running kernel keeps the old code until the machine restarts. |
The vulnerability
What the bug is
Make sure to drop the reference taken when looking up the DMA mux platform device during route allocation. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference.
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/lpc18xx-dmamux.c
- What this is
- DMA GENERIC OFFLOAD ENGINE SUBSYSTEMMAINTAINERS section matched on drivers/dma/ · dmaengine@vger.kernel.org · Maintained
- Kernel module
- none to look for. The file would have gone into lpc18xx_dmamux, and Debian does not compile it into that module, so finding lpc18xx_dmamux in lsmod would say nothing about this CVE.
Check it on the machine
grep -wE 'CONFIG_DMADEVICES|CONFIG_LPC18XX_DMAMUX' /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_DMADEVICES, CONFIG_LPC18XX_DMAMUX
- 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
- 2026-01-31 (9 months ago)source
- CVSS
- no vector published, unrated
- Attack vector
- not published
- EPSS
- 0.21%, higher than 10.2% 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 |
|---|---|---|
| 4.3 | 5.10.249 | 3d396ebfb304 |
| 4.3 | 5.15.199 | 499ddae78c4b |
| 4.3 | 6.1.162 | adef147a8d8c |
| 4.3 | 6.6.122 | 9fba97baa520 |
| 4.3 | 6.12.67 | 992eb8055a6e |
| 4.3 | 6.18.7 | 1e47d80f6720 |
| 4.3 | 6.19 | d4d63059dee7 |
Why the CNA scored it this way
The kernel CNA published no CVSS vector and no reasoning for CVE-2025-71188, which is why it is shown as unrated rather than given an invented score. 6,405 of the 20,413 CVEs here carry reasoning; this is not one of them.