CVE-2026-89826
HighCVSS 7.1Summary
In the Linux kernel, panthor_fw_read_build_info() in the drm/panthor driver validates the metadata range using 32-bit addition (hdr.meta_start + hdr.meta_size), which can wrap and let an out-of-bounds range pass. It also reads the "git_sha: " prefix without checking metadata length, and meta_size == 0 can underflow the NULL terminator index.
Risk Assessment
This may lead to out-of-bounds reads and potential kernel instability or data exposure.
Recommendation
Update the Linux kernel to a version with the fix using subtraction-based bounds checking and rejecting metadata too short for the expected prefix and trailing NULL byte.
Other vulnerabilities in Linux kernel (drm/panthor)
See all- CVE-2026-90409Unknown
In the Linux kernel, the drm/panthor driver does not verify that vm_bind mappings of user-exposed BOs avoid the region reserved for kernel BO mappings. This missing check can cause address space conflicts. The fix adds an overlap check and guards against 64-bit range overflow.
- CVE-2026-89825High
In the Linux kernel, panthor_init_cs_iface() and panthor_init_csg_iface() in the drm/panthor driver validate firmware control interface offsets using 32-bit arithmetic and the size of host wrapper structures, so the arithmetic can wrap before the bounds check and the checked size does not match the actual mapped firmware control interface.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/panthor: harden firmware build-info bounds checks panthor_fw_read_build_info() checks whether the metadata range fits in the firmware image with hdr.meta_start + hdr.meta_size. Both fields are u32, so the addition can wrap and let an out-of-bounds range pass validation. The function also reads the "git_sha: " prefix without first checking that the metadata is long enough, and meta_size == 0 can underflow the NULL terminator index. Use subtraction-based bounds checking and reject metadata that is too short to contain the expected prefix and trailing NULL byte.