{"schema_version":"1.9.0","id":"CVE-2022-50511","published":"2025-10-07T15:19:08.159Z","modified":"2026-08-12T03:51:48.751560810Z","related":["SUSE-SU-2025:4111-1","SUSE-SU-2025:4139-1","SUSE-SU-2025:4149-1","SUSE-SU-2025:4320-1"],"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 <TASK>\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 </TASK>","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"}]}],"versions":["v5.4.228","v6.1-rc1","v5.10.162","v5.10.161","v6.1.1","v6.0.15","v5.15.85","v6.1","v6.0.14","v5.15.84","v5.10.160","v6.0.13","v5.15.83","v5.10.159","v5.4.227","v6.1-rc8","v6.1-rc3","v6.0.12","v5.15.82","v5.10.158","v5.4.226","v6.1-rc6","v6.0.11","v5.15.81","v5.10.157","v5.4.225","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.0.10","v5.15.80","v5.10.156","v6.0.9","v5.15.79","v6.1-rc5","v5.10.155","v5.4.224","v6.0.8","v5.15.78","v5.10.154","v6.0.7","v5.15.77","v5.10.153","v5.4.223","v6.0.6","v5.15.76","v5.10.152","v5.4.222","v5.4.221","v5.10.151","v5.4.220","v5.15.75","v6.0.5","v5.10.150","v6.0-rc1","v5.10.149","v5.4.219","v6.0.4","v5.15.74","v6.0.3","v6.0.2","v5.10.148","v5.4.218","v6.0","v6.0.1","v5.15.73","v5.10.147","v5.4.217","v5.15.72","v6.0-rc7","v5.4.216","v5.15.71","v5.10.146","v5.4.215","v6.0-rc3","v6.0-rc2","v5.15.70","v5.10.145","v5.4.214","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.10.144","v5.15.69","v5.15.68","v5.10.143","v5.4.213","v5.4.212","v5.10.142","v5.15.67","v5.15.66","v5.15.65","v5.10.141","v5.15.64","v5.10.140","v5.4.211","v5.19","v5.15.63","v5.10.139","v5.10.138","v5.15.62","v5.10.137","v5.4.210","v5.15.61","v5.10.136","v5.15.60","v5.19-rc1","v5.15.59","v5.10.135","v5.4.209","v5.15.58","v5.10.134","v5.4.208","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.15.57","v5.10.133","v5.4.207","v5.19-rc3","v5.10.132","v5.15.56","v5.15.55","v5.10.131","v5.4.206","v5.19-rc4","v5.4.205","v5.10.130","v5.15.54","v5.15.53","v5.10.129","v5.4.204","v5.15.52","v5.10.128","v5.4.203","v5.15.51","v5.10.127","v5.4.202","v5.18-rc1","v5.15.50","v5.10.126","v5.4.201","v5.10.125","v5.15.49","v5.10.124","v5.4.200","v5.15.48","v5.10.123","v5.4.199","v5.15.47","v5.10.122","v5.4.198","v5.15.46","v5.10.121","v5.4.197","v5.15.45","v5.10.120","v5.15.44","v5.10.119","v5.4.196","v5.10.118","v5.15.43","v5.18-rc7","v5.18-rc2","v5.15.42","v5.15.41","v5.10.117","v5.4.195","v5.15.40","v5.10.116","v5.4.194","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.15.39","v5.10.115","v5.4.193","v5.15.38","v5.10.114","v5.4.192","v5.15.37","v5.10.113","v5.4.191","v5.15.36","v5.15.35","v5.10.112","v5.4.190","v5.15.34","v5.10.111","v5.4.189","v5.4.188","v5.10.110","v5.15.33","v5.10.109","v5.15.32","v5.17-rc6","v5.17-rc4","v5.15.31","v5.10.108","v5.4.187","v5.17-rc8","v5.17-rc7","v5.15.30","v5.10.107","v5.4.186","v5.17-rc1","v5.15.29","v5.10.106","v5.4.185","v5.17-rc3","v5.15.28","v5.10.105","v5.4.184","v5.17-rc2","v5.15.27","v5.10.104","v5.4.183","v5.15.26","v5.10.103","v5.4.182","v5.17-rc5","v5.16","v5.15.25","v5.10.102","v5.4.181","v5.15.24","v5.10.101","v5.4.180","v5.15.23","v5.10.100","v5.4.179","v5.15.22","v5.10.99","v5.4.178","v5.15.21","v5.10.98","v5.4.177","v5.15.20","v5.10.97","v5.15.19","v5.10.96","v5.4.176","v5.15.18","v5.10.95","v5.4.175","v5.15.17","v5.10.94","v5.4.174","v5.15.16","v5.10.93","v5.4.173","v5.4.172","v5.10.92","v5.15.15","v5.16-rc1","v5.4.171","v5.10.91","v5.15.14","v5.16-rc8","v5.15.13","v5.10.90","v5.4.170","v5.16-rc5","v5.16-rc6","v5.15.12","v5.10.89","v5.4.169","v5.16-rc7","v5.15.11","v5.10.88","v5.4.168","v5.16-rc3","v5.16-rc2","v5.15.10","v5.10.87","v5.4.167","v5.15.9","v5.10.86","v5.4.166","v5.16-rc4","v5.4.165","v5.10.85","v5.15.8","v5.4.164","v5.10.84","v5.15.7","v5.15","v5.15.6","v5.10.83","v5.4.163","v5.4.162","v5.10.82","v5.15.5","v5.4.161","v5.10.81","v5.15.4","v5.10.80","v5.15.3","v5.4.160","v5.15.2","v5.10.79","v5.4.159","v5.15.1","v5.10.78","v5.4.158","v5.10.77","v5.4.157","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.10.76","v5.4.156","v5.15-rc3","v5.15-rc5","v5.10.75","v5.4.155","v5.15-rc6","v5.10.74","v5.4.154","v5.14","v5.14-rc3","v5.10.73","v5.4.153","v5.4.152","v5.10.72","v5.10.71","v5.4.151","v5.14-rc1","v5.10.70","v5.4.150","v5.10.69","v5.4.149","v5.10.68","v5.4.148","v5.10.67","v5.4.147","v5.10.66","v5.4.146","v5.10.65","v5.10.64","v5.4.145","v5.10.63","v5.4.144","v5.10.62","v5.10.61","v5.4.143","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.4.142","v5.10.60","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.10.59","v5.4.141","v5.10.58","v5.4.140","v5.10.57","v5.4.139","v5.10.56","v5.4.138","v5.10.55","v5.4.137","v5.13","v5.4.136","v5.10.54","v5.10.53","v5.4.135","v5.10.52","v5.4.134","v5.4.133","v5.10.51","v5.10.50","v5.4.132","v5.10.49","v5.4.131","v5.10.48","v5.4.130","v5.13-rc6","v5.4.129","v5.10.47","v5.13-rc7","v5.4.128","v5.10.46","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.10.45","v5.4.127","v5.10.44","v5.4.126","v5.13-rc5","v5.10.43","v5.4.125","v5.10.42","v5.4.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