Live › vulnerability › CVE-2026-99004
Go to dashboardThe Linux kernel's Imagination GPU (drm/imagination) driver sizes its MMU page table preallocation incorrectly when a mapping crosses a page table boundary. The arithmetic can underflow and preallocate a huge number of MMU pages, exhausting system memory and causing an out-of-memory panic.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Only systems that use the Imagination PowerVR GPU through the drm/imagination kernel driver are exposed, typically certain embedded or ARM boards. Desktop and server systems without this GPU are unlikely to load the driver. The sources do not say which devices or kernel versions are confirmed affected.
No product ranges from the sources yet.
uname -r against your distribution's advisorylsmod | grep pvrEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
drm/imagination: Size page table preallocation by device address
Commit 0a8224058a58 ("drm/imagination: Fix page count for page table for map() interface") passed the device address to pvr_mmu_op_context_create(), but the preallocation is still sized from device_addr + sgt_offset with an exclusive end. The offset into the object's pages has no place in a device-virtual range, and the exclusive end allocates one table too many when the range ends on a table boundary.
Count the tables from device_addr and the inclusive end of the range.
The new calculation does not take page table indices into account. This fixes another issue with the previous implementation, where the difference between start and end indices could underflow when a mapping crossed a page table boundary. This would lead to the driver preallocating a huge number of MMU pages, exhausting system memory and triggering an out of memory panic.
[Alessio: add paragraph to point out OOM bug being fixed, cc stable]
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