CVE-2026-40021

Apache Log4net before version 3.3.0 contains a vulnerability in XmlLayout and XmlLayoutSchemaLog4J where characters forbidden by XML 1.0 are not sanitized in MDC keys/values and the identity field. The issue causes a serialization exception and silent loss of the affected log event, which can be ...

Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from a commit overflow issue in the ring-buffer, which could result in the loss of events...

Configure a Proper Value for audit_backlog_limit

auditbackloglimit sets the buffer queue length for audit events awaiting transfer to the audit service. The default value is 64. If the queue is full, audit events are discarded and an alarm log is generated, indicating that the queue is full. If the value is too small, audit events may be lost. ...