CVE-2026-74452 drm/panthor: reject firmware sections with oversized data
A heap buffer overflow in the Panthor GPU driver allows attackers to execute arbitrary code or escalate privileges via crafted firmware.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74452?
CVE-2026-74452 is a high-severity 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:
drm/panthor: reject firmware sections with oversized data
In panthor_fw_load_section_entry(), the data size to copy is calculated without validating it against the allocated section_size:
section->data.size = hdr.data.end - hdr.data.start;
If a crafted firmware sets data.size larger than the allocated memory, this could cause a heap buffer overflow in panthor_fw_init_section_mem()
memcpy(section->mem->kmap, section->data.buf, section->data.size);
Additionally, if the section->data.size exceeds the BO size, could this memset underflow the size calculation, leading to a massive out-of-bounds zeroing of kernel memory?
memset(section->mem->kmap + section->data.size, 0, panthor_kernel_bo_size(section->mem) - section->data.size);
Reject section entries whose initial data is larger than the section size.
Which versions are affected by CVE-2026-74452?
How do I fix CVE-2026-74452?
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-2026-74452 being exploited?
There is no known exploitation of CVE-2026-74452 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74452, DEBIAN-CVE-2026-74452, GHSA-3jx8-2xh9-q6mh, UBUNTU-CVE-2026-74452.