CVE-2026-74452drm/panthor: reject firmware sections with oversized data

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/0e57165ca025a67d8dfd17efd2765fdd4925fdab
• https://git.kernel.org/stable/c/2a761b9be5863e1d26a584f0c2d1e114a684ed9a
• https://git.kernel.org/stable/c/7f4674d986c15c74327cb6ac6e2e2afecf061e04
• https://git.kernel.org/stable/c/a3caaa06809248b996254be5b47e10804a3494e2