cbcvebase.
CVE-2022-50511
published 2025-10-07

CVE-2022-50511: 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…

PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.15%
4.4th percentile
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

Affected

18 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.4-1 (bookworm)linux 6.1.4-1 (bookworm)
linuxlinux——
linuxlinux>= c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < e039929e36818507e90901edae87f6fa8bc81093e039929e36818507e90901edae87f6fa8bc81093
linuxlinux>= c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < c9a9aa02f0fa3318e0ae5774f404419a1b4759cac9a9aa02f0fa3318e0ae5774f404419a1b4759ca
linuxlinux>= c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < e83b47580a0738361772d6f24286adfdaba57e36e83b47580a0738361772d6f24286adfdaba57e36
linuxlinux>= c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < 9c14a85e18a58c102ec223144b7edb5b345c1bea9c14a85e18a58c102ec223144b7edb5b345c1bea
linuxlinux>= c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < 890d91b31f4874361e0df047f57d268a7021cb12890d91b31f4874361e0df047f57d268a7021cb12
linuxlinux>= c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < 6fe888c4d2fb174408e4540bb2d5602b9f507f906fe888c4d2fb174408e4540bb2d5602b9f507f90
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.178-15.10.178-1
linuxlinux_kernel>= 0 < 6.1.4-16.1.4-1
linuxlinux_kernel>= 0 < 6.1.4-16.1.4-1
linuxlinux_kernel>= 0 < 6.1.4-16.1.4-1
linuxlinux_kernel>= 2.6.23.1 < 5.4.2295.4.229
linuxlinux_kernel>= 5.11 < 5.15.865.15.86
linuxlinux_kernel>= 5.16 < 6.0.166.0.16
linuxlinux_kernel>= 5.5 < 5.10.1635.10.163
linuxlinux_kernel>= 6.1 < 6.1.26.1.2

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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