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CVE-2025-21681— 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ovs_vport_send函数在设备注销时未正确检查设备是否处于运行状态，导致在尝试发送数据时可能陷入无限循环，锁定核心。

AI 预测 7.8 利用难度: 中等 EPSS 0.22% · P12

可能的 ATT&CK 技术 1 AI

T1499 · Endpoint Denial of Service

影响版本矩阵 16

厂商产品 版本范围状态
Linux Linux 9b0dd09c1ceb35950d2884848099fccc9ec9a123< b5c73fc92f8d15c16e5dc87b5c17d2abf1e6d092 affected
284be5db6c8d06d247ed056cfc448c4f79bbb16c< 87fcf0d137c770e6040ebfdb0abd8e7dd481b504 affected
5efcb301523baacd98a47553d4996e924923114d< 930268823f6bccb697aa5d2047aeffd4a497308c affected
644b3051b06ba465bc7401bfae9b14963cbc8c1c< ea9e990356b7bee95440ba0e6e83cc4d701afaca affected
066b86787fa3d97b7aefb5ac0a99a22dad2d15f8< ea966b6698785fb9cd0fdb867acd91b222e4723f affected
066b86787fa3d97b7aefb5ac0a99a22dad2d15f8< 82f433e8dd0629e16681edf6039d094b5518d8ed affected
066b86787fa3d97b7aefb5ac0a99a22dad2d15f8< 47e55e4b410f7d552e43011baa5be1aab4093990 affected
56252da41426f3d01957456f13caf46ce670ea29 affected
… +8 条更多
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一、 漏洞 CVE-2025-21681 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
openvswitch: fix lockup on tx to unregistering netdev with carrier
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix lockup on tx to unregistering netdev with carrier Commit in a fixes tag attempted to fix the issue in the following sequence of calls: do_output -> ovs_vport_send -> dev_queue_xmit -> __dev_queue_xmit -> netdev_core_pick_tx -> skb_tx_hash When device is unregistering, the 'dev->real_num_tx_queues' goes to zero and the 'while (unlikely(hash >= qcount))' loop inside the 'skb_tx_hash' becomes infinite, locking up the core forever. But unfortunately, checking just the carrier status is not enough to fix the issue, because some devices may still be in unregistering state while reporting carrier status OK. One example of such device is a net/dummy. It sets carrier ON on start, but it doesn't implement .ndo_stop to set the carrier off. And it makes sense, because dummy doesn't really have a carrier. Therefore, while this device is unregistering, it's still easy to hit the infinite loop in the skb_tx_hash() from the OVS datapath. There might be other drivers that do the same, but dummy by itself is important for the OVS ecosystem, because it is frequently used as a packet sink for tcpdump while debugging OVS deployments. And when the issue is hit, the only way to recover is to reboot. Fix that by also checking if the device is running. The running state is handled by the net core during unregistering, so it covers unregistering case better, and we don't really need to send packets to devices that are not running anyway. While only checking the running state might be enough, the carrier check is preserved. The running and the carrier states seem disjoined throughout the code and different drivers. And other core functions like __dev_direct_xmit() check both before attempting to transmit a packet. So, it seems safer to check both flags in OVS as well.
来源: CVE Program / CVE List V5
CVSS Information
N/A
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ovs_vport_send函数在设备注销时未正确检查设备是否处于运行状态，导致在尝试发送数据时可能陷入无限循环，锁定核心。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux 9b0dd09c1ceb35950d2884848099fccc9ec9a123 ~ b5c73fc92f8d15c16e5dc87b5c17d2abf1e6d092 -
Linux Linux 6.3 -

二、漏洞 CVE-2025-21681 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2025-21681 的情报信息

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CVE-2025-21681 补丁与修复 (7)

同批安全公告 · Linux · 2025-01-31 · 共 20 条

CVE-2025-21673 9.8 CRITICAL Linux kernel 资源管理错误漏洞
CVE-2025-21669 7.8 HIGH Linux kernel 代码问题漏洞
CVE-2025-21680 7.8 HIGH Linux kernel 输入验证错误漏洞
CVE-2025-21678 7.8 HIGH Linux kernel 安全漏洞
CVE-2025-21677 7.8 HIGH Linux kernel 安全漏洞
CVE-2025-21676 7.5 HIGH Linux kernel 代码问题漏洞
CVE-2025-21682 7.3 HIGH Linux kernel 代码问题漏洞
CVE-2025-21675 Linux kernel 代码问题漏洞
CVE-2025-21674 Linux kernel 安全漏洞
CVE-2025-21679 Linux kernel 安全漏洞
CVE-2025-21672 Linux kernel 安全漏洞
CVE-2025-21671 Linux kernel 资源管理错误漏洞
CVE-2025-21670 Linux kernel 代码问题漏洞
CVE-2025-21683 Linux kernel 安全漏洞
CVE-2025-21668 Linux kernel 安全漏洞
CVE-2025-21667 Linux kernel 安全漏洞
CVE-2025-21666 Linux kernel 代码问题漏洞
CVE-2025-21665 Linux kernel 安全漏洞
CVE-2024-57948 Linux kernel 安全漏洞

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21681

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