drm/nouveau: fix double-free in nvif_vmm_dtor

{
  "id": "f1b9078807fb2d33dc3586cc75cf751b03bee81e28f907bf9519d0dab8287b98",
  "url": "https://osv.dev/vulnerability/CVE-2026-98515",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/nouveau: fix double-free in nvif_vmm_dtor",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix double-free in nvif_vmm_dtor On failure, nouveau_cli_init() calls nouveau_cli_fini() to tear the client down. Then, nouveau_drm_open() also enters into its cleanup path and calls nouveau_cli_fini() AGAIN. nouveau_cli_fini() calls nouveau_vmm_fini(): void nouveau_vmm_fini(struct nouveau_vmm *vmm) { nouveau_svmm_fini(&vmm->svmm); nvif_vmm_dtor(&vmm->vmm); vmm->cli = NULL; } Inside nvif_vmm_dtor(), vmm->page is freed unconditionally: void nvif_vmm_dtor(struct nvif_vmm *vmm) { kfree(vmm->page); nvif_object_dtor(&vmm->object); } vmm->page is never cleared after being freed, so the second call of nvif_vmm_dtor() will cause a double-free. Found by fuzzing the nouveau driver with a modified Syzkaller: BUG: KASAN: double-free in nvif_vmm_dtor+0x31/0x50 drivers/gpu/drm/nouveau/nvif/vmm.c:194 Free of addr ffff888010fcdc30 by task syz.0.173/2567 CPU: 1 UID: 0 PID: 2567 Comm: syz.0.173 Not tainted 7.2.0 #24 PREEMPT(lazy) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x95/0xe0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcb/0x5a0 mm/kasan/report.c:482 kasan_report_invalid_free+0xaa/0xd0 mm/kasan/report.c:557 check_slab_allocation+0xe4/0x110 mm/kasan/common.c:235 kasan_slab_pre_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:2622 [",
    "evidence": "osv:CVE-2026-98515",
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    "severity": "high",
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:46.373919294Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/023e7a01f8fb27799f0987b5bcda325d73a2904c",
        "https://git.kernel.org/stable/c/109a8d2d5b7d2719ebe09df3f9241023900b3846",
        "https://git.kernel.org/stable/c/279e5ac137370e274a09dd552547ae6bddd0d4d5",
        "https://git.kernel.org/stable/c/375901ac0f286e81be00a4126e57d488cb401884",
        "https://git.kernel.org/stable/c/872a5473c02a26c955be44d52b7ab2f8ea70a2cf",
        "https://git.kernel.org/stable/c/97077ac87afe9e91ec074ef0be64454e7ccbf344",
        "https://git.kernel.org/stable/c/bf542ecd4f60d4689818d194e7ca74772fe0f8b5",
        "https://git.kernel.org/stable/c/f09f4a536935b15539f2de9fe775a2641202be90",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98515.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98515",
        "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-2026-98515.json"
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 514421,
  "published_at": "2026-10-18T15:17:31.953+00:00"
}