CVE-2026-72158 fpga: dfl: add bounds check in dfh_get_param_size()
A missing bounds check in the Linux kernel FPGA driver allows a malicious device to trigger memory corruption via crafted headers, potentially leading to system crashes or code execution.
- 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-2026-72158?
CVE-2026-72158 is a memory corruption vulnerability in Linux, published on 15 Aug 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:
fpga: dfl: add bounds check in dfh_get_param_size()
dfh_get_param_size() can return a parameter size larger than the feature region because the loop bounds check is evaluated before incrementing size. If the EOP (End of Parameters) bit is set in the same iteration, the inflated size is returned without re-validation against max.
This can cause create_feature_instance() to call memcpy_fromio() with a size exceeding the ioremap'd region when a malicious FPGA device provides crafted DFHv1 parameter headers.
Add a bounds check after the size increment to ensure the accumulated size never exceeds the feature boundary.
Which versions are affected by CVE-2026-72158?
How do I fix CVE-2026-72158?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-72158 being exploited?
There is no known exploitation of CVE-2026-72158 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72158, DEBIAN-CVE-2026-72158, GHSA-765f-xmg8-8m66, UBUNTU-CVE-2026-72158.