CVE-2025-38503

一、漏洞信息
 漏洞编号：[CVE-2025-38503](https://nvd.nist.gov/vuln/detail/CVE-2025-38503)
 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: fix assertion when building free space treeWhen building the free space tree with the block group tree featureenabled, we can hit an assertion failure like this:  BTRFS info (device loop0 state M): rebuilding free space tree  assertion failed: ret == 0, in fs/btrfs/free-space-tree.c:1102  ------------[ cut here ]------------  kernel BUG at fs/btrfs/free-space-tree.c:1102!  Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP  Modules linked in:  CPU: 1 UID: 0 PID: 6592 Comm: syz-executor322 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025  pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102  lr : populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102  sp : ffff8000a4ce7600  x29: ffff8000a4ce76e0 x28: ffff0000c9bc6000 x27: ffff0000ddfff3d8  x26: ffff0000ddfff378 x25: dfff800000000000 x24: 0000000000000001  x23: ffff8000a4ce7660 x22: ffff70001499cecc x21: ffff0000e1d8c160  x20: ffff0000e1cb7800 x19: ffff0000e1d8c0b0 x18: 00000000ffffffff  x17: ffff800092f39000 x16: ffff80008ad27e48 x15: ffff700011e740c0  x14: 1ffff00011e740c0 x13: 0000000000000004 x12: ffffffffffffffff  x11: ffff700011e740c0 x10: 0000000000ff0100 x9 : 94ef24f55d2dbc00  x8 : 94ef24f55d2dbc00 x7 : 0000000000000001 x6 : 0000000000000001  x5 : ffff8000a4ce6f98 x4 : ffff80008f415ba0 x3 : ffff800080548ef0  x2 : 0000000000000000 x1 : 0000000100000000 x0 : 000000000000003e  Call trace:   populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102 (P)   btrfs_rebuild_free_space_tree+0x14c/0x54c fs/btrfs/free-space-tree.c:1337   btrfs_start_pre_rw_mount+0xa78/0xe10 fs/btrfs/disk-io.c:3074   btrfs_remount_rw fs/btrfs/super.c:1319 [inline]   btrfs_reconfigure+0x828/0x2418 fs/btrfs/super.c:1543   reconfigure_super+0x1d4/0x6f0 fs/super.c:1083   do_remount fs/namespace.c:3365 [inline]   path_mount+0xb34/0xde0 fs/namespace.c:4200   do_mount fs/namespace.c:4221 [inline]   __do_sys_mount fs/namespace.c:4432 [inline]   __se_sys_mount fs/namespace.c:4409 [inline]   __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4409   __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]   invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49   el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132   do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151   el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767   el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786   el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600  Code: f0047182 91178042 528089c3 9771d47b (d4210000)  ---[ end trace 0000000000000000 ]---This happens because we are processing an empty block group, which hasno extents allocated from it, there are no items for this block group,including the block group item since block group items are stored in adedicated tree when using the block group tree feature. It also meansthis is the block group with the highest start offset, so there are nohigher keys in the extent root, hence btrfs_search_slot_for_read()returns 1 (no higher key found).Fix this by asserting  ret  is 0 only if the block group tree featureis not enabled, in which case we should find a block group item forthe block group since it s stored in the extent root and block groupitem keys are greater than extent item keys (the value forBTRFS_BLOCK_GROUP_ITEM_KEY is 192 and for BTRFS_EXTENT_ITEM_KEY andBTRFS_METADATA_ITEM_KEY the values are 168 and 169 respectively).In case  ret  is 1, we just need to add a record to the free spacetree which spans the whole block group, and we can achieve this bymaking  ret == 0  as the while loop s condition.
 漏洞公开时间：2025-08-16 19:15:42
 漏洞创建时间：2025-08-16 19:21:20
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-38503
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
|  | https://security-tracker.debian.org/tracker/CVE-2025-38503 |  |
|  | https://ubuntu.com/security/CVE-2025-38503 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-38503 |  |
|  | https://git.kernel.org/linus/1961d20f6fa8903266ed9bd77c691924c22c8f02 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025081645-CVE-2025-38503-8580@gregkh/T/#u |  |
|  | https://docs.bell-sw.com/security/cves/CVE-2025-38503 |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2025-38503 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-38503 |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2025-38503 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025081645-CVE-2025-38503-8580@gregkh/T |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2391055 |  |
|  | https://linux.oracle.com/cve/CVE-2025-38503.html |  |
|  | https://linux.oracle.com/errata/ELSA-2025-20551.html |  |
|  | https://git.kernel.org/stable/c/0bcc14f36c7ad37121cf5c0ae18cdde5bfad9c4e |  |
|  | https://git.kernel.org/stable/c/1961d20f6fa8903266ed9bd77c691924c22c8f02 |  |
|  | https://git.kernel.org/stable/c/6bbe6530b1db7b4365ce9e86144c18c5d73b2c5b |  |
|  | https://git.kernel.org/stable/c/7c77df23324f60bcff0ea44392e2c82e9486640c |  |
|  | https://git.kernel.org/stable/c/f4428b2d4c68732653e93f748f538bdee639ff80 |  |

</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  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://git.kernel.org/linus/1961d20f6fa8903266ed9bd77c691924c22c8f02 |  | osv |
|  |  | https://git.kernel.org/stable/c/0bcc14f36c7ad37121cf5c0ae18cdde5bfad9c4e |  | snyk |
|  |  | https://git.kernel.org/stable/c/1961d20f6fa8903266ed9bd77c691924c22c8f02 |  | snyk |
|  |  | https://git.kernel.org/stable/c/6bbe6530b1db7b4365ce9e86144c18c5d73b2c5b |  | snyk |
|  |  | https://git.kernel.org/stable/c/7c77df23324f60bcff0ea44392e2c82e9486640c |  | snyk |
|  |  | https://git.kernel.org/stable/c/f4428b2d4c68732653e93f748f538bdee639ff80 |  | 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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CVE-2025-38503

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