CVE-2026-68260

/// Technical 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/0

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References