CVE-2026-90405 media: stm32: dcmi: fix some error handling bugs in probe()
A null pointer dereference in the STM32 DCMI driver probe function can cause a kernel crash, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90405?
CVE-2026-90405 is a vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
media: stm32: dcmi: fix some error handling bugs in probe()
There are a few issues here:
1) After we assign: chan = dma_request_chan(&pdev->dev, "tx"); Then the error paths need to clean up before returning. The first error path does a direct return. 2) The error paths check "dcmi->mdma_chan" but that is not assigned until later so it results in memory leaks. Test "mdma_chan" instead. 3) The error handling calls dma_release_channel(dcmi->dma_chan) before "dcmi->dma_chan" has been assigned which leads to a NULL pointer dereference. Use the "chan" variable instead.
I also moved the call to dma_release_channel() after the call to dma_release_channel() so it mirrors the allocation code better.
Which versions are affected by CVE-2026-90405?
How do I fix CVE-2026-90405?
Apply the vendor's patch.
Is CVE-2026-90405 being exploited?
There is no known exploitation of CVE-2026-90405 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-90405, GHSA-8r39-p738-wgfm, UBUNTU-CVE-2026-90405.