CVE-2025-39738

一、漏洞信息
 漏洞编号：[CVE-2025-39738](https://nvd.nist.gov/vuln/detail/CVE-2025-39738)
 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:btrfs: do not allow relocation of partially dropped subvolumes[BUG]There is an internal report that balance triggered transaction abort,with the following call trace:  item 85 key (594509824 169 0) itemoff 12599 itemsize 33          extent refs 1 gen 197740 flags 2          ref#0: tree block backref root 7  item 86 key (594558976 169 0) itemoff 12566 itemsize 33          extent refs 1 gen 197522 flags 2          ref#0: tree block backref root 7 ... BTRFS error (device loop0): extent item not found for insert, bytenr 594526208 num_bytes 16384 parent 449921024 root_objectid 934 owner 1 offset 0 BTRFS error (device loop0): failed to run delayed ref for logical 594526208 num_bytes 16384 type 182 action 1 ref_mod 1: -117 ------------[ cut here ]------------ BTRFS: Transaction aborted (error -117) WARNING: CPU: 1 PID: 6963 at ../fs/btrfs/extent-tree.c:2168 btrfs_run_delayed_refs+0xfa/0x110 [btrfs]And btrfs check doesn t report anything wrong related to the extenttree.[CAUSE]The cause is a little complex, firstly the extent tree indeed doesn thave the backref for 594526208.The extent tree only have the following two backrefs around that bytenron-disk:        item 65 key (594509824 METADATA_ITEM 0) itemoff 13880 itemsize 33                refs 1 gen 197740 flags TREE_BLOCK                tree block skinny level 0                (176 0x7) tree block backref root CSUM_TREE        item 66 key (594558976 METADATA_ITEM 0) itemoff 13847 itemsize 33                refs 1 gen 197522 flags TREE_BLOCK                tree block skinny level 0                (176 0x7) tree block backref root CSUM_TREEBut the such missing backref item is not an corruption on disk, as theoffending delayed ref belongs to subvolume 934, and that subvolume isbeing dropped:        item 0 key (934 ROOT_ITEM 198229) itemoff 15844 itemsize 439                generation 198229 root_dirid 256 bytenr 10741039104 byte_limit 0 bytes_used 345571328                last_snapshot 198229 flags 0x1000000000001(RDONLY) refs 0                drop_progress key (206324 EXTENT_DATA 2711650304) drop_level 2                level 2 generation_v2 198229And that offending tree block 594526208 is inside the dropped range ofthat subvolume.  That explains why there is no backref item for thatbytenr and why btrfs check is not reporting anything wrong.But this also shows another problem, as btrfs will do all the orphansubvolume cleanup at a read-write mount.So half-dropped subvolume should not exist after an RW mount, andbalance itself is also exclusive to subvolume cleanup, meaning weshouldn t hit a subvolume half-dropped during relocation.The root cause is, there is no orphan item for this subvolume.In fact there are 5 subvolumes from around 2021 that have the sameproblem.It looks like the original report has some older kernels running, andcaused those zombie subvolumes.Thankfully upstream commit 8d488a8c7ba2 ( btrfs: fix subvolume/snapshotdeletion not triggered on mount ) has long fixed the bug.[ENHANCEMENT]For repairing such old fs, btrfs-progs will be enhanced.Considering how delayed the problem will show up (at run delayed reftime) and at that time we have to abort transaction already, it is toolate.Instead here we reject any half-dropped subvolume for reloc tree at theearliest time, preventing confusion and extra time wasted on debuggingsimilar bugs.
 漏洞公开时间：2025-09-12 01:15:35
 漏洞创建时间：2025-09-12 01:31:19
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-39738
<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/fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc |  |
|  | https://git.kernel.org/stable/c/fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3 |  |
|  | https://git.kernel.org/stable/c/f83d4c81bda3b7d1813268ab77408f7a0ce691ff |  |
|  | https://git.kernel.org/stable/c/39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51 |  |
|  | https://git.kernel.org/stable/c/125e94a4b76b7b75d194f85bedd628097d2121f0 |  |
|  | https://git.kernel.org/stable/c/4e403bd8e127d40dc7c05f06ee969c1ba1537ec5 |  |
|  | https://git.kernel.org/stable/c/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025091137-CVE-2025-39738-aed1@gregkh/T/#u |  |
|  | https://security-tracker.debian.org/tracker/CVE-2025-39738 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-39738 |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2025-39738 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025091137-CVE-2025-39738-aed1@gregkh/T |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2394629 |  |
|  | https://docs.bell-sw.com/security/cves/CVE-2025-39738 |  |
|  | https://ubuntu.com/security/CVE-2025-39738 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-39738 |  |
|  | https://git.kernel.org/linus/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  |
|  | https://git.kernel.org/stable/c/125e94a4b76b7b75d194f85bedd628097d2121f0 |  |
|  | https://git.kernel.org/stable/c/39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51 |  |
|  | https://git.kernel.org/stable/c/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  |
|  | https://git.kernel.org/stable/c/4e403bd8e127d40dc7c05f06ee969c1ba1537ec5 |  |
|  | https://git.kernel.org/stable/c/f83d4c81bda3b7d1813268ab77408f7a0ce691ff |  |
|  | https://git.kernel.org/stable/c/fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc |  |
|  | https://git.kernel.org/stable/c/fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3 |  |
|  | http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-39738 |  |
|  | https://git.kernel.org/stable/c/125e94a4b76b7b75d194f85bedd628097d2121f0 |  |
|  | https://git.kernel.org/stable/c/39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51 |  |
|  | https://git.kernel.org/stable/c/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  |
|  | https://git.kernel.org/stable/c/4e403bd8e127d40dc7c05f06ee969c1ba1537ec5 |  |
|  | https://git.kernel.org/stable/c/f83d4c81bda3b7d1813268ab77408f7a0ce691ff |  |
|  | https://git.kernel.org/stable/c/fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc |  |
|  | https://git.kernel.org/stable/c/fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3 |  |

</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://github.com/gregkh/linux/commit/4289b494ac553e74e86fed1c66b2bf9530bc1082.patch |  | ljqc |
|  |  | https://git.kernel.org/stable/c/fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/f83d4c81bda3b7d1813268ab77408f7a0ce691ff |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/125e94a4b76b7b75d194f85bedd628097d2121f0 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/4e403bd8e127d40dc7c05f06ee969c1ba1537ec5 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  | cvelistv5 |
|  |  | https://git.kernel.org/linus/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  | osv |
|  |  | https://git.kernel.org/stable/c/125e94a4b76b7b75d194f85bedd628097d2121f0 |  | osv |
|  |  | https://git.kernel.org/stable/c/39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51 |  | osv |
|  |  | https://git.kernel.org/stable/c/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  | osv |
|  |  | https://git.kernel.org/stable/c/4e403bd8e127d40dc7c05f06ee969c1ba1537ec5 |  | osv |
|  |  | https://git.kernel.org/stable/c/f83d4c81bda3b7d1813268ab77408f7a0ce691ff |  | osv |
|  |  | https://git.kernel.org/stable/c/fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc |  | osv |
|  |  | https://git.kernel.org/stable/c/fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3 |  | osv |
|  |  | https://git.kernel.org/stable/c/125e94a4b76b7b75d194f85bedd628097d2121f0 |  | snyk |
|  |  | https://git.kernel.org/stable/c/39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51 |  | snyk |
|  |  | https://git.kernel.org/stable/c/4289b494ac553e74e86fed1c66b2bf9530bc1082 |  | snyk |
|  |  | https://git.kernel.org/stable/c/4e403bd8e127d40dc7c05f06ee969c1ba1537ec5 |  | snyk |
|  |  | https://git.kernel.org/stable/c/f83d4c81bda3b7d1813268ab77408f7a0ce691ff |  | snyk |
|  |  | https://git.kernel.org/stable/c/fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc |  | snyk |
|  |  | https://git.kernel.org/stable/c/fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3 |  | snyk |

</details>
 
二、漏洞分析结构反馈
 影响性分析说明：
  
 openEuler评分：
   
 受影响版本排查(受影响/不受影响)：
  1.master(6.12.33):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3(5.10.0):
4.openEuler-22.03-LTS-SP4(5.10.0):
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):
8.openEuler-24.03-LTS-SP2(6.6.0):

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

原因说明：
  1.master(6.12.33):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3(5.10.0):
4.openEuler-22.03-LTS-SP4(5.10.0):
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):
8.openEuler-24.03-LTS-SP2(6.6.0):

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