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CVE-2022-50511 (GCVE-0-2022-50511)

Vulnerability from cvelistv5 – Published: 2025-10-07 15:19 – Updated: 2026-05-11 19:20
VLAI
Title
lib/fonts: fix undefined behavior in bit shift for get_default_font
Summary
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' <TASK> 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 </TASK>
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 , < e039929e36818507e90901edae87f6fa8bc81093 (git)
Affected: c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 , < c9a9aa02f0fa3318e0ae5774f404419a1b4759ca (git)
Affected: c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 , < e83b47580a0738361772d6f24286adfdaba57e36 (git)
Affected: c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 , < 9c14a85e18a58c102ec223144b7edb5b345c1bea (git)
Affected: c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 , < 890d91b31f4874361e0df047f57d268a7021cb12 (git)
Affected: c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 , < 6fe888c4d2fb174408e4540bb2d5602b9f507f90 (git)
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Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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      "title": "lib/fonts: fix undefined behavior in bit shift for get_default_font",
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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 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:18:27+00:00",
      "cve": "CVE-2022-50511",
      "id": "CVE-2022-50511",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: lib/fonts: fix undefined behavior in bit shift for get_default_font",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50511.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:26:51Z",
      "cve": "CVE-2022-50511",
      "id": "CVE-2022-50511",
      "initial_release_date": "2025-10-08T23:39:34Z",
      "product_status:known_affected": "556",
      "product_status:known_not_affected": "170",
      "product_status:recommended": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50511",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50511.json",
      "version": "46"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.