fbdev: Fix unregistering of framebuffers without device

{
  "id": "275b5a3ab3dedcd5d9a462987148bd28869d2679736a77488fe8cf76591644a6",
  "url": "https://osv.dev/vulnerability/CVE-2022-49070",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fbdev: Fix unregistering of framebuffers without device",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix unregistering of framebuffers without device OF framebuffers do not have an underlying device in the Linux device hierarchy. Do a regular unregister call instead of hot unplugging such a non-existing device. Fixes a NULL dereference. An example error message on ppc64le is shown below. BUG: Kernel NULL pointer dereference on read at 0x00000060 Faulting instruction address: 0xc00000000080dfa4 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries [...] CPU: 2 PID: 139 Comm: systemd-udevd Not tainted 5.17.0-ae085d7f9365 #1 NIP: c00000000080dfa4 LR: c00000000080df9c CTR: c000000000797430 REGS: c000000004132fe0 TRAP: 0300 Not tainted (5.17.0-ae085d7f9365) MSR: 8000000002009033 CR: 28228282 XER: 20000000 CFAR: c00000000000c80c DAR: 0000000000000060 DSISR: 40000000 IRQMASK: 0 GPR00: c00000000080df9c c000000004133280 c00000000169d200 0000000000000029 GPR04: 00000000ffffefff c000000004132f90 c000000004132f88 0000000000000000 GPR08: c0000000015658f8 c0000000015cd200 c0000000014f57d0 0000000048228283 GPR12: 0000000000000000 c00000003fffe300 0000000020000000 0000000000000000 GPR16: 0000000000000000 0000000113fc4a40 0000000000000005 0000000113fcfb80 GPR20: 000001000f7283b0 0000000000000000 c000000000e4a588 c000000000e4a5b0 GPR24: 0000000000000001 00000000000a0000 c008000000db0168 c0000000021f6ec0 GPR28: c0000000016d65a8 c000000004b36460 0000000000000000 c0000000016",
    "evidence": "osv:CVE-2022-49070",
    "products": [
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.15.34",
            "evidence": "/affected/1/ranges"
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            "value": "5.16.20",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.17.3",
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    "severity": "medium",
    "structured": {
      "id": "CVE-2022-49070",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
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      ],
      "modified": "2026-10-28T02:30:23.610280785Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0f525289ff0ddeb380813bd81e0f9bdaaa1c9078",
        "https://git.kernel.org/stable/c/2388f826cdc9af2651991adc0feb79de9bdf2232",
        "https://git.kernel.org/stable/c/de33df481545974ba47c46f05194e769e4307843",
        "https://git.kernel.org/stable/c/feed87ff122b1640c221d4dd559442ab2cd50bb1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49070.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49070",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49070.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": 489895,
  "published_at": "2025-02-26T01:54:36.36+00:00"
}