fbdev: pxafb: Fix possible use after free in pxafb_task()

{
  "id": "b4df95643d1408741b5fe9dd8dad677ddd9ad02ab0220b343568c98a48b190ee",
  "url": "https://osv.dev/vulnerability/CVE-2024-49924",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fbdev: pxafb: Fix possible use after free in pxafb_task()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fbdev: pxafb: Fix possible use after free in pxafb_task() In the pxafb_probe function, it calls the pxafb_init_fbinfo function, after which &fbi->task is associated with pxafb_task. Moreover, within this pxafb_init_fbinfo function, the pxafb_blank function within the &pxafb_ops struct is capable of scheduling work. If we remove the module which will call pxafb_remove to make cleanup, it will call unregister_framebuffer function which can call do_unregister_framebuffer to free fbi->fb through put_fb_info(fb_info), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | pxafb_task pxafb_remove | unregister_framebuffer(info) | do_unregister_framebuffer(fb_info) | put_fb_info(fb_info) | // free fbi->fb | set_ctrlr_state(fbi, state) | __pxafb_lcd_power(fbi, 0) | fbi->lcd_power(on, &fbi->fb.var) | //use fbi->fb Fix it by ensuring that the work is canceled before proceeding with the cleanup in pxafb_remove. Note that only root user can remove the driver at runtime.",
    "evidence": "osv:CVE-2024-49924",
    "products": [
      {
        "name": {
          "value": "Kernel",
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        "prerequisites": [],
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    "severity": "high",
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      "aliases": [
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          "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": "2026-10-28T02:30:38.149223941Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3c0d416eb4bef705f699213cee94bf54b6acdacd",
        "https://git.kernel.org/stable/c/4a6921095eb04a900e0000da83d9475eb958e61e",
        "https://git.kernel.org/stable/c/4cda484e584be34d55ee17436ebf7ad11922b97a",
        "https://git.kernel.org/stable/c/6d0a07f68b66269e167def6c0b90a219cd3e7473",
        "https://git.kernel.org/stable/c/a3a855764dbacbdb1cc51e15dc588f2d21c93e0e",
        "https://git.kernel.org/stable/c/aaadc0cb05c999ccd8898a03298b7e5c31509b08",
        "https://git.kernel.org/stable/c/e657fa2df4429f3805a9b3e47fb1a4a1b02a72bd",
        "https://git.kernel.org/stable/c/e6897e299f57b103e999e62010b88e363b3eebae",
        "https://git.kernel.org/stable/c/fdda354f60a576d52dcf90351254714681df4370",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49924.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-49924",
        "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/2024/49xxx/CVE-2024-49924.json"
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    "related_cves": [
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        "value": "CVE-2024-49924",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505023,
  "published_at": "2024-10-21T18:01:49.076+00:00"
}