drm/msm: RCU-free the scheduler-containing ring and VM objects

{
  "id": "e10a77c0f81bca39b6dc284a46038a521ef23208ea26e9e6e70b6b737202386c",
  "url": "https://osv.dev/vulnerability/CVE-2026-98180",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/msm: RCU-free the scheduler-containing ring and VM objects",
    "summary": "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/",
    "evidence": "osv:CVE-2026-98180",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-98180",
      "aliases": [
        "CVE-2026-98180"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "d81bf4581903b0cba0698cd4d1c07fc6be21754a"
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                {
                  "fixed": "713abac5c04ccbae67f9ac68c3921845535388e7"
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                {
                  "fixed": "01c8d1f385f788f1bbbbb7687c4386d614281218"
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          "database_specific": {
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "6.18.54"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                  "fixed": "7.2.8"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98180.json"
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        }
      ],
      "modified": "2026-10-28T02:30:37.192255259Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/01c8d1f385f788f1bbbbb7687c4386d614281218",
        "https://git.kernel.org/stable/c/713abac5c04ccbae67f9ac68c3921845535388e7",
        "https://git.kernel.org/stable/c/d81bf4581903b0cba0698cd4d1c07fc6be21754a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98180.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98180",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98180.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98180",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504492,
  "published_at": "2026-10-06T08:44:23.327+00:00"
}