CVE-2025-68241

一、漏洞信息
 漏洞编号：[CVE-2025-68241](https://nvd.nist.gov/vuln/detail/CVE-2025-68241)
 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 V4.0分值：
  BaseScore：N/A None
  Vector：
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:ipv4: route: Prevent rt_bind_exception() from rebinding stale fnheThe sit driver s packet transmission path calls: sit_tunnel_xmit() ->update_or_create_fnhe(), which lead to fnhe_remove_oldest() being calledto delete entries exceeding FNHE_RECLAIM_DEPTH+random.The race window is between fnhe_remove_oldest() selecting fnheX fordeletion and the subsequent kfree_rcu(). During this time, theconcurrent path s __mkroute_output() -> find_exception() can fetch thesoon-to-be-deleted fnheX, and rt_bind_exception() then binds it with anew dst using a dst_hold(). When the original fnheX is freed via RCU,the dst reference remains permanently leaked.CPU 0                             CPU 1__mkroute_output()  find_exception() [fnheX]                                  update_or_create_fnhe()                                    fnhe_remove_oldest() [fnheX]  rt_bind_exception() [bind dst]                                  RCU callback [fnheX freed, dst leak]This issue manifests as a device reference count leak and a warning indmesg when unregistering the net device:  unregister_netdevice: waiting for sitX to become free. Usage count = NIdo Schimmel provided the simple test validation method [1].The fix clears  oldest->fnhe_daddr  before calling fnhe_flush_routes().Since rt_bind_exception() checks this field, setting it to zero preventsthe stale fnhe from being reused and bound to a new dst just before itis freed.[1]ip netns add ns1ip -n ns1 link set dev lo upip -n ns1 address add 192.0.2.1/32 dev loip -n ns1 link add name dummy1 up type dummyip -n ns1 route add 192.0.2.2/32 dev dummy1ip -n ns1 link add name gretap1 up arp off type gretap      local 192.0.2.1 remote 192.0.2.2ip -n ns1 route add 198.51.0.0/16 dev gretap1taskset -c 0 ip netns exec ns1 mausezahn gretap1      -A 198.51.100.1 -B 198.51.0.0/16 -t udp -p 1000 -c 0 -q &taskset -c 2 ip netns exec ns1 mausezahn gretap1      -A 198.51.100.1 -B 198.51.0.0/16 -t udp -p 1000 -c 0 -q &sleep 10ip netns pids ns1 | xargs killip netns del ns1
 漏洞公开时间：2025-12-16 23:15:53
 漏洞创建时间：2025-12-17 14:32:55
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-68241
<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/b8a44407bdaf2f0c5505cc7d9fc7d8da90cf9a94 |  |
|  | https://git.kernel.org/stable/c/0fd16ed6dc331636fb2a874c42d2f7d3156f7ff0 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025121632-CVE-2025-68241-854d@gregkh/T |  |
|  | https://git.kernel.org/stable/c/4b7210da22429765d19460d38c30eeca72656282 |  |
|  | https://advisory.echohq.com/cve/CVE-2025-68241 |  |
|  | https://git.kernel.org/stable/c/b84f083f50ecc736a95091691339a1b363962f0e |  |
|  | https://git.kernel.org/stable/c/041ab9ca6e80d8f792bb69df28ebf1ef39c06af8 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2025-68241 |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2422773 |  |
|  | https://git.kernel.org/stable/c/ac1499fcd40fe06479e9b933347b837ccabc2a40 |  |
|  | https://git.kernel.org/stable/c/298f1e0694ab4edb6092d66efed93c4554e6ced1 |  |
|  | https://git.kernel.org/stable/c/69d35c12168f9c59b159ae566f77dfad9f96d7ca |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2025-68241 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025121632-CVE-2025-68241-854d@gregkh/T/#u |  |

</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/69d35c12168f9c59b159ae566f77dfad9f96d7ca |  | ljqc |
|  |  | https://git.kernel.org/stable/c/b8a44407bdaf2f0c5505cc7d9fc7d8da90cf9a94 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/0fd16ed6dc331636fb2a874c42d2f7d3156f7ff0 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/4b7210da22429765d19460d38c30eeca72656282 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/b84f083f50ecc736a95091691339a1b363962f0e |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/041ab9ca6e80d8f792bb69df28ebf1ef39c06af8 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/ac1499fcd40fe06479e9b933347b837ccabc2a40 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/298f1e0694ab4edb6092d66efed93c4554e6ced1 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/69d35c12168f9c59b159ae566f77dfad9f96d7ca |  | cvelistv5 |

</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):
9.openEuler-24.03-LTS-SP3(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):
9.openEuler-24.03-LTS-SP3(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):
9.openEuler-24.03-LTS-SP3(6.6.0):

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