{"id":"CVE-2022-50390","url":"https://www.cyber-defence.io/tools/cve/CVE-2022-50390","generatedAt":"2026-10-27T20:54:19.405Z","title":"In the Linux kernel, the following vulnerability has been resolved: drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED\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 ./include/drm/ttm/ttm_tt.h:122:26\nleft shift of 1 by 31 places cannot be represented in type 'int'\nCall Trace:\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 ttm_bo_move_memcpy+0x3b4/0x460 [ttm]\n bo_driver_move+0x32/0x40 [drm_vram_helper]\n ttm_bo_handle_move_mem+0x118/0x200 [ttm]\n ttm_bo_validate+0xfa/0x220 [ttm]\n drm_gem_vram_pin_locked+0x70/0x1b0 [drm_vram_helper]\n drm_gem_vram_pin+0x48/0xb0 [drm_vram_helper]\n drm_gem_vram_plane_helper_prepare_fb+0x53/0xe0 [drm_vram_helper]\n drm_gem_vram_simple_display_pipe_prepare_fb+0x26/0x30 [drm_vram_helper]\n drm_simple_kms_plane_prepare_fb+0x4d/0xe0 [drm_kms_helper]\n drm_atomic_helper_prepare_planes+0xda/0x210 [drm_kms_helper]\n drm_atomic_helper_commit+0xc3/0x1e0 [drm_kms_helper]\n drm_atomic_commit+0x9c/0x160 [drm]\n drm_client_modeset_commit_atomic+0x33a/0x380 [drm]\n drm_client_modeset_commit_locked+0x77/0x220 [drm]\n drm_client_modeset_commit+0x31/0x60 [drm]\n __drm_fb_helper_restore_fbdev_mode_unlocked+0xa7/0x170 [drm_kms_helper]\n drm_fb_helper_set_par+0x51/0x90 [drm_kms_helper]\n fbcon_init+0x316/0x790\n visual_init+0x113/0x1d0\n do_bind_con_driver+0x2a3/0x5c0\n do_take_over_console+0xa9/0x270\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>","published":"2025-09-18T14:15:38.000Z","lastModified":"2026-06-17T05:23:25.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":["linux/linux kernel"],"epss":{"score":0.00166,"percentile":0.05836,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/2ff0309b73d86e8591881ac035af06e01c112e89","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/387659939c00156f8d6bab0fbc55b4eaf2b6bc5b","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6528971fdce0dfc0a28fec42c151a1eccdabadf5","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c4079a34c0adef9f35a16783fb13a9084406f96d","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-50390","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}