CVE-2026-99004 drm/imagination: Size page table preallocation by device address
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99004?
CVE-2026-99004 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
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]
Which versions are affected by CVE-2026-99004?
How do I fix CVE-2026-99004?
Upgrade to a fixed version.
Is CVE-2026-99004 being exploited?
There is no known exploitation of CVE-2026-99004 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-99004, DEBIAN-CVE-2026-99004, GHSA-862j-6x74-2p6m, UBUNTU-CVE-2026-99004.