{"id":"CVE-2022-50511","summary":"lib/fonts: fix undefined behavior in bit shift for get_default_font","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 'int'\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","modified":"2026-04-02T08:28:34.696528Z","published":"2025-10-07T15:19:08.159Z","related":["SUSE-SU-2025:4111-1","SUSE-SU-2025:4139-1","SUSE-SU-2025:4149-1","SUSE-SU-2025:4320-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50511.json","cna_assigner":"Linux"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50511.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50511"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801"},{"fixed":"e039929e36818507e90901edae87f6fa8bc81093"},{"fixed":"c9a9aa02f0fa3318e0ae5774f404419a1b4759ca"},{"fixed":"e83b47580a0738361772d6f24286adfdaba57e36"},{"fixed":"9c14a85e18a58c102ec223144b7edb5b345c1bea"},{"fixed":"890d91b31f4874361e0df047f57d268a7021cb12"},{"fixed":"6fe888c4d2fb174408e4540bb2d5602b9f507f90"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50511.json"}}],"schema_version":"1.7.5"}