{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50511","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-10-07T15:11:44.887Z","datePublished":"2025-10-07T15:19:08.159Z","dateUpdated":"2026-05-11T19:20:50.723Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:20:50.723Z"},"descriptions":[{"lang":"en","value":"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":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["lib/fonts/fonts.c"],"versions":[{"version":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801","lessThan":"e039929e36818507e90901edae87f6fa8bc81093","status":"affected","versionType":"git"},{"version":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801","lessThan":"c9a9aa02f0fa3318e0ae5774f404419a1b4759ca","status":"affected","versionType":"git"},{"version":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801","lessThan":"e83b47580a0738361772d6f24286adfdaba57e36","status":"affected","versionType":"git"},{"version":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801","lessThan":"9c14a85e18a58c102ec223144b7edb5b345c1bea","status":"affected","versionType":"git"},{"version":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801","lessThan":"890d91b31f4874361e0df047f57d268a7021cb12","status":"affected","versionType":"git"},{"version":"c81f717cb9e0bd91dc4b98753cb2705ab0fe2801","lessThan":"6fe888c4d2fb174408e4540bb2d5602b9f507f90","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["lib/fonts/fonts.c"],"versions":[{"version":"2.6.23","status":"affected"},{"version":"0","lessThan":"2.6.23","status":"unaffected","versionType":"semver"},{"version":"5.4.229","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.163","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.86","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.0.16","lessThanOrEqual":"6.0.*","status":"unaffected","versionType":"semver"},{"version":"6.1.2","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.4.229"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.10.163"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.15.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.0.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.1.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093"},{"url":"https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca"},{"url":"https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36"},{"url":"https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea"},{"url":"https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12"},{"url":"https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90"}],"title":"lib/fonts: fix undefined behavior in bit shift for get_default_font","x_generator":{"engine":"bippy-1.2.0"}}}}