CVE-2025-21721

一、漏洞信息
 漏洞编号：[CVE-2025-21721](https://nvd.nist.gov/vuln/detail/CVE-2025-21721)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.1.8,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：5.5 Medium
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:nilfs2: handle errors that nilfs_prepare_chunk() may returnPatch series  nilfs2: fix issues with rename operations .This series fixes BUG_ON check failures reported by syzbot around renameoperations, and a minor behavioral issue where the mtime of a childdirectory changes when it is renamed instead of moved.This patch (of 2):The directory manipulation routines nilfs_set_link() andnilfs_delete_entry() rewrite the directory entry in the folio/pagepreviously read by nilfs_find_entry(), so error handling is omitted on theassumption that nilfs_prepare_chunk(), which prepares the buffer forrewriting, will always succeed for these.  And if an error is returned, ittriggers the legacy BUG_ON() checks in each routine.This assumption is wrong, as proven by syzbot: the buffer layer called bynilfs_prepare_chunk() may call nilfs_get_block() if necessary, which mayfail due to metadata corruption or other reasons.  This has been there allalong, but improved sanity checks and error handling may have made it morereproducible in fuzzing tests.Fix this issue by adding missing error paths in nilfs_set_link(),nilfs_delete_entry(), and their caller nilfs_rename().
 漏洞公开时间：2025-02-27 10:15:15
 漏洞创建时间：2025-02-27 11:24:59
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-21721
<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/1ee2d454baa361d2964e3e2f2cca9ee3f769d93c |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/481136234dfe96c7f92770829bec6111c7c5f5dd |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/607dc724b162f4452dc768865e578c1a509a1c8c |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/7891ac3b0a5c56f7148af507306308ab841cdc31 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b38c6c260c2415c7f0968871305e7a093daabb4c |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/eddd3176b8c4c83a46ab974574cda7c3dfe09388 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ee70999a988b8abc3490609142f50ebaa8344432 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f70bd2d8ca454e0ed78970f72147ca321dbaa015 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2025-21721 | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2025-21721 | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://git.kernel.org/stable/c/481136234dfe96c7f92770829bec6111c7c5f5dd | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://git.kernel.org/stable/c/eddd3176b8c4c83a46ab974574cda7c3dfe09388 | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://git.kernel.org/stable/c/ee70999a988b8abc3490609142f50ebaa8344432 | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2025/CVE-2025-21721.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://git.kernel.org/stable/c/7891ac3b0a5c56f7148af507306308ab841cdc31 | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2348563 | https://bugzilla.suse.com/show_bug.cgi?id=1238858 |

</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_kernel | 6.12.13 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=eddd3176b8c4c83a46ab974574cda7c3dfe09388Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2ba466d74ed74f073257f86e61519cb8f8f46184 | linuxkernelcves |
| linux_kernel | 6.13.2 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=481136234dfe96c7f92770829bec6111c7c5f5ddIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2ba466d74ed74f073257f86e61519cb8f8f46184 | linuxkernelcves |
| linux_kernel | 6.14-rc1 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ee70999a988b8abc3490609142f50ebaa8344432Please | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2ba466d74ed74f073257f86e61519cb8f8f46184 | linuxkernelcves |

</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:nilfs2: handle errors that nilfs_prepare_chunk() may returnPatch series  nilfs2: fix issues with rename operations .This series fixes BUG_ON check failures reported by syzbot around renameoperations, and a minor behavioral issue where the mtime of a childdirectory changes when it is renamed instead of moved.This patch (of 2):The directory manipulation routines nilfs_set_link() andnilfs_delete_entry() rewrite the directory entry in the folio/pagepreviously read by nilfs_find_entry(), so error handling is omitted on theassumption that nilfs_prepare_chunk(), which prepares the buffer forrewriting, will always succeed for these.  And if an error is returned, ittriggers the legacy BUG_ON() checks in each routine.This assumption is wrong, as proven by syzbot: the buffer layer called bynilfs_prepare_chunk() may call nilfs_get_block() if necessary, which mayfail due to metadata corruption or other reasons.  This has been there allalong, but improved sanity checks and error handling may have made it morereproducible in fuzzing tests.Fix this issue by adding missing error paths in nilfs_set_link(),nilfs_delete_entry(), and their caller nilfs_rename().
 openEuler评分：
  5.5
 Vector：CVSS：3.0/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-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):受影响
4.openEuler-24.03-LTS:受影响
5.openEuler-24.03-LTS-SP1:受影响
6.master(6.12.33):不受影响
7.openEuler-24.03-LTS-Next: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-SP3(5.10.0):否
3.master(6.12.33):否
4.openEuler-24.03-LTS:否
5.openEuler-24.03-LTS-Next:否
6.openEuler-22.03-LTS-SP4(5.10.0):否
7.openEuler-24.03-LTS-SP1:否

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

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-1450

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