CVE-2025-38626

一、漏洞信息
 漏洞编号：[CVE-2025-38626](https://nvd.nist.gov/vuln/detail/CVE-2025-38626)
 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:f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs modew/  mode=lfs  mount option, generic/299 will cause system panic as below:------------[ cut here ]------------kernel BUG at fs/f2fs/segment.c:2835!Call Trace: <TASK> f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7eRIP: 0010:new_curseg+0x70f/0x720The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs maytrigger foreground gc only if it allocates any physical block, it will bea little bit later when there is multiple threads writing data w/aio/dio/bufio method in parallel, since we always use OPU in lfs mode, sof2fs_map_blocks() does block allocations aggressively.In order to fix this issue, let s give a chance to trigger foregroundgc in prior to block allocation in f2fs_map_blocks().
 漏洞公开时间：2025-08-23 00:15:36
 漏洞创建时间：2025-08-23 00:44:35
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-38626
<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/1005a3ca28e90c7a64fa43023f866b960a60f791 |  |
|  | https://git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 |  |
|  | https://git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968 |  |
|  | https://git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253 |  |
|  | https://git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee |  |
|  | https://lore.kernel.org/linux-cve-announce/2025082231-CVE-2025-38626-1e63@gregkh/T/#u |  |
|  | https://security-tracker.debian.org/tracker/CVE-2025-38626 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-38626 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025082231-CVE-2025-38626-1e63@gregkh/T |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2390406 |  |
|  | https://ubuntu.com/security/CVE-2025-38626 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-38626 |  |
|  | https://git.kernel.org/linus/1005a3ca28e90c7a64fa43023f866b960a60f791 |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2025-38626 |  |

</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/82765ce5c7a56f9309ee45328e763610eaf11253 |  | ljqc |
|  |  | https://git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791 |  | nvd |
|  |  | https://git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 |  | nvd |
|  |  | https://git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968 |  | nvd |
|  |  | https://git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253 |  | nvd |
|  |  | https://git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee |  | nvd |
|  |  | https://git.kernel.org/linus/1005a3ca28e90c7a64fa43023f866b960a60f791 |  | osv |

</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:f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs modew/ &#34;mode=lfs&#34; mount option, generic/299 will cause system panic as below:------------[ cut here ]------------kernel BUG at fs/f2fs/segment.c:2835!Call Trace: &lt;TASK&gt; f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7eRIP: 0010:new_curseg+0x70f/0x720The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs maytrigger foreground gc only if it allocates any physical block, it will bea little bit later when there is multiple threads writing data w/aio/dio/bufio method in parallel, since we always use OPU in lfs mode, sof2fs_map_blocks() does block allocations aggressively.In order to fix this issue, let&#39;s give a chance to trigger foregroundgc in prior to block allocation in f2fs_map_blocks().The Linux kernel CVE team has assigned CVE-2025-38626 to this issue.
 openEuler评分：
  3.9
 Vector：CVSS：3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
 受影响版本排查(受影响/不受影响)：
  1.master:不受影响
2.openEuler-20.03-LTS-SP4(4.19.90):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: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):不受影响-组件不存在
2.openEuler-22.03-LTS-SP3(5.10.0):不受影响-组件不存在
3.openEuler-22.03-LTS-SP4(5.10.0):不受影响-组件不存在
4.openEuler-24.03-LTS(6.6.0):不受影响-组件不存在
5.openEuler-24.03-LTS-SP1(6.6.0):不受影响-组件不存在
6.openEuler-24.03-LTS-SP2(6.6.0):不受影响-组件不存在
7.master:不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发

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