GHSA-72CP-V89Q-9P3W

Vulnerability from github – Published: 2025-10-07 18:31 – Updated: 2025-10-07 18:31
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

lib/fonts: fix undefined behavior in bit shift for get_default_font

Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below:

UBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20 left shift of 1 by 31 places cannot be represented in type 'int' dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c get_default_font+0x1c7/0x1f0 fbcon_startup+0x347/0x3a0 do_take_over_console+0xce/0x270 do_fbcon_takeover+0xa1/0x170 do_fb_registered+0x2a8/0x340 fbcon_fb_registered+0x47/0xe0 register_framebuffer+0x294/0x4a0 __drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper] drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper] drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper] drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper] bochs_pci_probe+0x6ca/0x772 [bochs] local_pci_probe+0x4d/0xb0 pci_device_probe+0x119/0x320 really_probe+0x181/0x550 __driver_probe_device+0xc6/0x220 driver_probe_device+0x32/0x100 __driver_attach+0x195/0x200 bus_for_each_dev+0xbb/0x120 driver_attach+0x27/0x30 bus_add_driver+0x22e/0x2f0 driver_register+0xa9/0x190 __pci_register_driver+0x90/0xa0 bochs_pci_driver_init+0x52/0x1000 [bochs] do_one_initcall+0x76/0x430 do_init_module+0x61/0x28a load_module+0x1f82/0x2e50 __do_sys_finit_module+0xf8/0x190 __x64_sys_finit_module+0x23/0x30 do_syscall_64+0x58/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50511"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-07T16:15:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/fonts: fix undefined behavior in bit shift for get_default_font\n\nShifting signed 32-bit value by 31 bits is undefined, so changing\nsignificant bit to unsigned.  The UBSAN warning calltrace like below:\n\nUBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20\nleft shift of 1 by 31 places cannot be represented in type \u0027int\u0027\n \u003cTASK\u003e\n dump_stack_lvl+0x7d/0xa5\n dump_stack+0x15/0x1b\n ubsan_epilogue+0xe/0x4e\n __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c\n get_default_font+0x1c7/0x1f0\n fbcon_startup+0x347/0x3a0\n do_take_over_console+0xce/0x270\n do_fbcon_takeover+0xa1/0x170\n do_fb_registered+0x2a8/0x340\n fbcon_fb_registered+0x47/0xe0\n register_framebuffer+0x294/0x4a0\n __drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]\n drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]\n drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]\n drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]\n bochs_pci_probe+0x6ca/0x772 [bochs]\n local_pci_probe+0x4d/0xb0\n pci_device_probe+0x119/0x320\n really_probe+0x181/0x550\n __driver_probe_device+0xc6/0x220\n driver_probe_device+0x32/0x100\n __driver_attach+0x195/0x200\n bus_for_each_dev+0xbb/0x120\n driver_attach+0x27/0x30\n bus_add_driver+0x22e/0x2f0\n driver_register+0xa9/0x190\n __pci_register_driver+0x90/0xa0\n bochs_pci_driver_init+0x52/0x1000 [bochs]\n do_one_initcall+0x76/0x430\n do_init_module+0x61/0x28a\n load_module+0x1f82/0x2e50\n __do_sys_finit_module+0xf8/0x190\n __x64_sys_finit_module+0x23/0x30\n do_syscall_64+0x58/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \u003c/TASK\u003e",
  "id": "GHSA-72cp-v89q-9p3w",
  "modified": "2025-10-07T18:31:07Z",
  "published": "2025-10-07T18:31:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50511"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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