CVE-2025-21864— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在删除网络命名空间时未及时释放secpath，可能导致释放后重用。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 68822bdf76f10c3dc80609d4e2cdc1e847429086< 87858bbf21da239ace300d61dd209907995c0491 |
affected |
68822bdf76f10c3dc80609d4e2cdc1e847429086< f1d5e6a5e468308af7759cf5276779d3155c5e98 |
affected | ||
68822bdf76f10c3dc80609d4e2cdc1e847429086< cd34a07f744451e2ecf9005bb7d24d0b2fb83656 |
affected | ||
68822bdf76f10c3dc80609d4e2cdc1e847429086< 69cafd9413084cd5012cf5d7c7ec6f3d493726d9 |
affected | ||
68822bdf76f10c3dc80609d4e2cdc1e847429086< 9b6412e6979f6f9e0632075f8f008937b5cd4efd |
affected | ||
5.19 |
affected | ||
< 5.19 |
unaffected | ||
6.1.130≤ 6.1.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2025-21864 基础信息
漏洞信息
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Vulnerability Title
tcp: drop secpath at the same time as we currently drop dst
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tcp: drop secpath at the same time as we currently drop dst
Xiumei reported hitting the WARN in xfrm6_tunnel_net_exit while
running tests that boil down to:
- create a pair of netns
- run a basic TCP test over ipcomp6
- delete the pair of netns
The xfrm_state found on spi_byaddr was not deleted at the time we
delete the netns, because we still have a reference on it. This
lingering reference comes from a secpath (which holds a ref on the
xfrm_state), which is still attached to an skb. This skb is not
leaked, it ends up on sk_receive_queue and then gets defer-free'd by
skb_attempt_defer_free.
The problem happens when we defer freeing an skb (push it on one CPU's
defer_list), and don't flush that list before the netns is deleted. In
that case, we still have a reference on the xfrm_state that we don't
expect at this point.
We already drop the skb's dst in the TCP receive path when it's no
longer needed, so let's also drop the secpath. At this point,
tcp_filter has already called into the LSM hooks that may require the
secpath, so it should not be needed anymore. However, in some of those
places, the MPTCP extension has just been attached to the skb, so we
cannot simply drop all extensions.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在删除网络命名空间时未及时释放secpath，可能导致释放后重用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2025-21864 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21864 其他参考 (5)
同批安全公告 · Linux · 2025-03-12 · 共 26 条
| CVE-2024-58087 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21850 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21855 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-58089 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21858 | 7.8 HIGH | Linux kernel 资源管理错误漏洞 |
| CVE-2025-21851 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21844 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21853 | Linux kernel 安全漏洞 | |
| CVE-2024-58088 | Linux kernel 安全漏洞 | |
| CVE-2025-21845 | Linux kernel 安全漏洞 | |
| CVE-2025-21846 | Linux kernel 安全漏洞 | |
| CVE-2025-21848 | Linux kernel 安全漏洞 | |
| CVE-2025-21847 | Linux kernel 安全漏洞 | |
| CVE-2025-21849 | Linux kernel 安全漏洞 | |
| CVE-2025-21852 | Linux kernel 安全漏洞 | |
| CVE-2025-21866 | Linux kernel 安全漏洞 | |
| CVE-2025-21854 | Linux kernel 安全漏洞 | |
| CVE-2025-21856 | Linux kernel 安全漏洞 | |
| CVE-2025-21857 | Linux kernel 安全漏洞 | |
| CVE-2025-21859 | Linux kernel 安全漏洞 |
显示前 20 条，共 26 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21864
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