远程 CentOS Linux 9 主机上安装的多个程序包受到 kernel-5.14.0-645.el9 版本变更日志中提及的一个漏洞影响。

  - 已修复 Linux 内核中的下列漏洞：can: j1939: implement NETDEV_UNREGISTER notification handler syzbot is reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 problem, for j1939 protocol did not have NETDEV_UNREGISTER notification handler for undoing changes made by j1939_sk_bind(). Commit 25fe97cb7620 (can: j1939: move j1939_priv_put() into sk_destruct callback) expects that a call to j1939_priv_put() can be unconditionally delayed until j1939_sk_sock_destruct() is called. But we need to call j1939_priv_put() against an extra ref held by j1939_sk_bind() call (as a part of undoing changes made by j1939_sk_bind()) as soon as NETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct() is called via j1939_sk_release()). Otherwise, the extra ref on struct j1939_priv held by j1939_sk_bind() call prevents struct net_device from dropping the usage count to 1; making it impossible for unregister_netdevice() to continue. [mkl: remove space in front of label] (CVE-2025-39925)

请注意，Nessus 尚未测试此问题，而是只依据应用程序自我报告的版本号进行判断。

检测

CentOS 9 : kernel-5.14.0-645.el9

critical Nessus 插件 ID 276945

版本 1.1