CVE-2022-50511

一、漏洞信息
 漏洞编号：[CVE-2022-50511](https://nvd.nist.gov/vuln/detail/CVE-2022-50511)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：N/A None
  Vector：CVSS：3.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:lib/fonts: fix undefined behavior in bit shift for get_default_fontShifting signed 32-bit value by 31 bits is undefined, so changingsignificant bit to unsigned.  The UBSAN warning calltrace like below:UBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20left 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>
 漏洞公开时间：2025-10-08 00:15:34
 漏洞创建时间：2025-10-07 23:31:21
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2022-50511
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
|  | https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90 |  |
|  | https://security-tracker.debian.org/tracker/CVE-2022-50511 |  |
|  | https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12 |  |
|  | https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea |  |
|  | https://www.cve.org/CVERecord?id=CVE-2022-50511 |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2402295 |  |
|  | https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36 |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2022-50511 |  |
|  | https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca |  |
|  | https://lore.kernel.org/linux-cve-announce/2025100701-CVE-2022-50511-5d8d@gregkh/T |  |
|  | https://lore.kernel.org/linux-cve-announce/2025100701-CVE-2022-50511-5d8d@gregkh/T/#u |  |
|  | https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093 |  |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  七彩瞬析开源风险感知平台
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| gregkh/linux |  | https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90 |  | ljqc |
|  |  | https://git.kernel.org/stable/c/6fe888c4d2fb174408e4540bb2d5602b9f507f90 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/890d91b31f4874361e0df047f57d268a7021cb12 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/9c14a85e18a58c102ec223144b7edb5b345c1bea |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/e83b47580a0738361772d6f24286adfdaba57e36 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/c9a9aa02f0fa3318e0ae5774f404419a1b4759ca |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/e039929e36818507e90901edae87f6fa8bc81093 |  | cvelistv5 |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
                            In the Linux kernel, the following vulnerability has been resolved:lib/fonts: fix undefined behavior in bit shift for get_default_fontShifting signed 32-bit value by 31 bits is undefined, so changingsignificant bit to unsigned.  The UBSAN warning calltrace like below:UBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20left shift of 1 by 31 places cannot be represented in type  int  &lt;TASK&gt; 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 &lt;/TASK&gt;The Linux kernel CVE team has assigned CVE-2022-50511 to this issue.             
 openEuler评分：
  4.4
 Vector：CVSS：3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP4(4.19.90):受影响
2.master(6.12.33):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.openEuler-24.03-LTS(6.6.0):不受影响
6.openEuler-24.03-LTS-Next(6.6.0):不受影响
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响
8.openEuler-24.03-LTS-SP2(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.master(6.12.33):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.openEuler-22.03-LTS-SP4(5.10.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否
8.openEuler-24.03-LTS-SP2(6.6.0):否

原因说明：
  1.openEuler-20.03-LTS-SP4(4.19.90):正常修复
2.master(6.12.33):不受影响-漏洞代码不能被攻击者触发
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不能被攻击者触发
5.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不能被攻击者触发
6.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-SP2(6.6.0):不受影响-漏洞代码不能被攻击者触发

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