---
id: CVE-2026-98949
title: 'drm/imagination: Fix reference and vm_bo handling in remap()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/imagination: Fix reference and vm_bo handling in remap()

  When a map overlaps part of an existing mapping, pvr_vm_gpuva_remap()
  splits the mapping into prev/next pa…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 <
    521cf8403a185a9d5790fe324bb43ba7ea85f51c
  - >-
    Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 <
    9caa2eca5cc8372517ff36a83f321d4326abae93
  - >-
    Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 <
    784356aa88b82035d70e9faeded49b70cddeb29e
  - >-
    Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 <
    196d4d10c1b33ae176685ff42a9994a5952b1d0f
  - Linux 6.8
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T12:19:08.946Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98949'
references:
  - url: 'https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c'
  - url: 'https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93'
  - url: 'https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e'
  - url: 'https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.560Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/imagination: Fix reference and vm_bo handling in remap()

When a map overlaps part of an existing mapping, pvr_vm_gpuva_remap()
splits the mapping into prev/next parts covering what the request did
not take, instead of creating something new. It gets two things wrong.

- A GEM reference is taken for each part but it's never needed and never
  dropped, so it leaks one reference per split (remap-next-in-2m in
  tests/imagination/pvr_vm_map.c):

    CRITICAL: 33558528 bytes of shmem still held after close

- The parts still belong to the original object being split, but
  pvr_vm_gpuva_remap() links them to ctx->gpuvm_bo, the new object's
  vm_bo:

    prev_va --obj--> BO_A          BO_B <--obj-- vm_bo (ctx->gpuvm_bo)
            \___________link___________/  (mismatch: BO_A != BO_B)

  drm_gpuva_link() catches the mismatch:

    WARNING: drivers/gpu/drm/drm_gpuvm.c:2108 at drm_gpuva_link+0x2ec/0x310
      drm_WARN_ON(obj != vm_bo->obj)
    Call trace:
     drm_gpuva_link
     pvr_vm_gpuva_remap
     __drm_gpuvm_sm_map
     pvr_vm_map
     pvr_ioctl_vm_map

  Link them to op->remap.unmap->va->vm_bo instead.

The locking of the GPUVA lists of the other objects touched by a split is
not addressed here; it is handled by switching the GPUVM to immediate
mode.

## Affected

- `Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 < 521cf8403a185a9d5790fe324bb43ba7ea85f51c`
- `Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 < 9caa2eca5cc8372517ff36a83f321d4326abae93`
- `Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 < 784356aa88b82035d70e9faeded49b70cddeb29e`
- `Linux >= ff5f643de0bf27874c4033cd57a0bd034b5c7d11 < 196d4d10c1b33ae176685ff42a9994a5952b1d0f`
- `Linux 6.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.