lib/fonts: fix undefined behavior in bit shift for get_default_font (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.16 % · percentile 5 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Analyzed
Description
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' <TASK> 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 </TASK>
References
- https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093
- https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca
- https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36
- https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea
- https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12
- https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2025-32051
- GCVE · GCVE-0-2022-50511
CERT-FR advisories
- CERTFR-2025-AVI-1073 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-1032 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 2.6.23.1 < 5.4.229cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.5 < 5.10.163cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.86cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.0.16cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.1 < 6.1.2cpe:2.3:o:linux:linux_kernel:2.6.23:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc8:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.23:rc9:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < e039929e36818507e90901edae87f6fa8bc81093 ; affected c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < c9a9aa02f0fa3318e0ae5774f404419a1b4759ca ; affected c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < e83b47580a0738361772d6f24286adfdaba57e36 ; affected c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < 9c14a85e18a58c102ec223144b7edb5b345c1bea ; affected c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < 890d91b31f4874361e0df047f57d268a7021cb12 ; affected c81f717cb9e0bd91dc4b98753cb2705ab0fe2801 < 6fe888c4d2fb174408e4540bb2d5602b9f507f90 |
| Linux · Linux | affected 2.6.23 ; unaffected 0 < 2.6.23 ; unaffected 5.4.229 ≤ 5.4.* ; unaffected 5.10.163 ≤ 5.10.* ; unaffected 5.15.86 ≤ 5.15.* ; unaffected 6.0.16 ≤ 6.0.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |