CVE-2026-68260 drm/imagination: acquire vm_ctx->lock before mapping memory to GPU VM
A race condition in the Imagination GPU driver causes a null pointer dereference, leading to a kernel crash and denial of service.
- 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-2026-68260?
CVE-2026-68260 is a high-severity vulnerability in Linux, published on 10 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/imagination: acquire vm_ctx->lock before mapping memory to GPU VM
The drm gpuvm code doesn't protect find operation against map operation, and the driver needs to ensure a map operation shouldn't happen when a find operation is in progress.
In some cases a find operation will be in progress when doing map/unmap operations, and the find operation will do a NULL pointer dereference.
An example of the stack trace of such NULL dereference is shown below:
``` Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000010
[<ffffffff01e989d4>] drm_gpuva_find+0x28/0x6c [drm_gpuvm] [<ffffffff01ed3a40>] pvr_vm_unmap+0x34/0x68 [powervr] [<ffffffff01ec69da>] pvr_ioctl_vm_unmap+0x2e/0x50 [powervr] [<ffffffff8080ce0a>] drm_ioctl_kernel+0x8e/0xdc [<ffffffff8080d016>] drm_ioctl+0x1be/0x3e0 [<ffffffff802bec3e>] __riscv_sys_ioctl+0xba/0xc4 [<ffffffff80d858b2>] do_trap_ecall_u+0x23e/0x3f4 [<ffffffff80d92288>] handle_exception+0x168/0x174 ```
As all occurences of drm_gpuva_find*() are already guarded by vm_ctx->lock, make pvr_vm_map() to acquire this lock to prevent disturbing any find operation. This fixes the NULL deference problem in drm_gpuva_find*().
Which versions are affected by CVE-2026-68260?
How do I fix CVE-2026-68260?
Apply the vendor's patch.
Is CVE-2026-68260 being exploited?
There is no known exploitation of CVE-2026-68260 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68260, DEBIAN-CVE-2026-68260, GHSA-qrmv-vc96-x8hw, UBUNTU-CVE-2026-68260.