CVE-2024-41085

一、漏洞信息
 漏洞编号：[CVE-2024-41085](https://nvd.nist.gov/vuln/detail/CVE-2024-41085)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 CVSS V2.0分值：
  BaseScore：0.0 Medium
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:cxl/mem: Fix no cxl_nvd during pmem region auto-assemblingWhen CXL subsystem is auto-assembling a pmem region during cxlendpoint port probing, always hit below calltrace. BUG: kernel NULL pointer dereference, address: 0000000000000078 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page RIP: 0010:cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem] Call Trace:  <TASK>  ? __die+0x24/0x70  ? page_fault_oops+0x82/0x160  ? do_user_addr_fault+0x65/0x6b0  ? exc_page_fault+0x7d/0x170  ? asm_exc_page_fault+0x26/0x30  ? cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem]  ? cxl_pmem_region_probe+0x1ac/0x360 [cxl_pmem]  cxl_bus_probe+0x1b/0x60 [cxl_core]  really_probe+0x173/0x410  ? __pfx___device_attach_driver+0x10/0x10  __driver_probe_device+0x80/0x170  driver_probe_device+0x1e/0x90  __device_attach_driver+0x90/0x120  bus_for_each_drv+0x84/0xe0  __device_attach+0xbc/0x1f0  bus_probe_device+0x90/0xa0  device_add+0x51c/0x710  devm_cxl_add_pmem_region+0x1b5/0x380 [cxl_core]  cxl_bus_probe+0x1b/0x60 [cxl_core]The cxl_nvd of the memdev needs to be available during the pmem regionprobe. Currently the cxl_nvd is registered after the endpoint port probe.The endpoint probe, in the case of autoassembly of regions, can cause apmem region probe requiring the not yet available cxl_nvd. Adjust thesequence so this dependency is met.This requires adding a port parameter to cxl_find_nvdimm_bridge() thatcan be used to query the ancestor root port. The endpoint port is notyet available, but will share a common ancestor with its parent, sostart the query from there instead.
 漏洞公开时间：2024-07-30 00:15:03
 漏洞创建时间：2024-07-30 01:38:37
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-41085
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-41085 | https://bugzilla.suse.com/show_bug.cgi?id=1228478 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-41085.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1228478 |
| suse_bugzilla | https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600 | https://bugzilla.suse.com/show_bug.cgi?id=1228478 |
| suse_bugzilla | https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96 | https://bugzilla.suse.com/show_bug.cgi?id=1228478 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-41085 | https://bugzilla.suse.com/show_bug.cgi?id=1228478 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-41085 | https://ubuntu.com/security/CVE-2024-41085 |
| ubuntu | https://git.kernel.org/linus/84ec985944ef34a34a1605b93ce401aa8737af96 (6.10-rc7) | https://ubuntu.com/security/CVE-2024-41085 |
| ubuntu | https://git.kernel.org/stable/c/1d064e4fbebcf5b18dc10c1f3973487eb163b600 | https://ubuntu.com/security/CVE-2024-41085 |
| ubuntu | https://git.kernel.org/stable/c/84ec985944ef34a34a1605b93ce401aa8737af96 | https://ubuntu.com/security/CVE-2024-41085 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-41085 | https://ubuntu.com/security/CVE-2024-41085 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-41085 | https://ubuntu.com/security/CVE-2024-41085 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-41085 | https://ubuntu.com/security/CVE-2024-41085 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-41085 |

</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:
  openBrain开源漏洞感知系统
 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  |
| ------- | -------- | ------- | -------- | --------- |
| linux |  | https://git.kernel.org/linus/84ec985944ef34a34a1605b93ce401aa8737af96 | https://git.kernel.org/linus/f17b558d6663101f876a1d9cbbad3de0c8f4ce4d | ubuntu |

</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:cxl/mem: Fix no cxl_nvd during pmem region auto-assemblingWhen CXL subsystem is auto-assembling a pmem region during cxlendpoint port probing, always hit below calltrace. BUG: kernel NULL pointer dereference, address: 0000000000000078 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page RIP: 0010:cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem] Call Trace:  &lt;TASK&gt;  ? __die+0x24/0x70  ? page_fault_oops+0x82/0x160  ? do_user_addr_fault+0x65/0x6b0  ? exc_page_fault+0x7d/0x170  ? asm_exc_page_fault+0x26/0x30  ? cxl_pmem_region_probe+0x22e/0x360 [cxl_pmem]  ? cxl_pmem_region_probe+0x1ac/0x360 [cxl_pmem]  cxl_bus_probe+0x1b/0x60 [cxl_core]  really_probe+0x173/0x410  ? __pfx___device_attach_driver+0x10/0x10  __driver_probe_device+0x80/0x170  driver_probe_device+0x1e/0x90  __device_attach_driver+0x90/0x120  bus_for_each_drv+0x84/0xe0  __device_attach+0xbc/0x1f0  bus_probe_device+0x90/0xa0  device_add+0x51c/0x710  devm_cxl_add_pmem_region+0x1b5/0x380 [cxl_core]  cxl_bus_probe+0x1b/0x60 [cxl_core]The cxl_nvd of the memdev needs to be available during the pmem regionprobe. Currently the cxl_nvd is registered after the endpoint port probe.The endpoint probe, in the case of autoassembly of regions, can cause apmem region probe requiring the not yet available cxl_nvd. Adjust thesequence so this dependency is met.This requires adding a port parameter to cxl_find_nvdimm_bridge() thatcan be used to query the ancestor root port. The endpoint port is notyet available, but will share a common ancestor with its parent, sostart the query from there instead.The Linux kernel CVE team has assigned CVE-2024-41085 to this issue.    
 openEuler评分：
  5.5
 Vector：CVSS：2.0/AV:L/AC:L/PR:L/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-24.03-LTS(6.6.0):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP1(5.10.0):不受影响
4.openEuler-22.03-LTS-SP3(5.10.0):不受影响
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响
6.master(6.1.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master(6.1.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-22.03-LTS-SP4(5.10.0):否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-1960

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