# CVE-2026-98180: drm/msm: RCU-free the scheduler-containing ring and VM objects

CVE-2026-98180 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98180 (version 7.2.8-1), released October 6, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-98180
- Priority: Urgent
- CVSS: 9.8 (Critical)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 6, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98180

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/msm: RCU-free the scheduler-containing ring and VM objects  Both struct msm_ringbuffer and struct msm_gem_vm embed a struct drm_gpu_scheduler.  msm_ringbuffer_destroy() and the VM free callback msm_gem_vm_free() call drm_sched_fini() on the embedded scheduler and then free the containing object with plain kfree().  drm_sched_fence_get_timeline_name() returns fence->sched->name, and the scheduler fence keeps a .release callback so it is not ops-detached on signalling.  A finished fence exported to userspace (the submit out-fence, or a VM_BIND fence, via sync_file / drm_syncobj) keeps pointing at the embedded scheduler after the ring/VM is freed, so a later get_timeline_name() -- reachable unprivileged through SYNC_IOC_FILE_INFO -- dereferences freed slab memory (KASAN slab-use-after-free read).  Per the dma-fence lifetime contract the exporter must keep the data backing a signalled fence alive for an RCU grace period.  Free the scheduler-containing objects with kfree_rcu() instead of kfree().  Patchwork: https://patchwork.freedesktop.org/patch/750234/

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.8-1 | [DEBIAN-CVE-2026-98180](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98180.md) | Oct 6, 2026 |

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