Red Hat Security Advisory: kernel security update

Important

A flaw was found in the Linux kernel. The `ipc_idr_alloc()` function, used in the checkpoint/restore path for SysV Inter-Process Communication (IPC) ID allocation, does not properly limit ID allocation to the valid range. This can result in the system attempting to dereference freed memory, leading to a use-after-free vulnerability. This issue could potentially cause system instability or information disclosure.

CWE-825 - Expired Pointer Dereference

A flaw was found in the Linux kernel's Transparent Inter-Process Communication (TIPC) module. This vulnerability, a double-free, occurs when the `tipc_buf_append()` function incorrectly handles memory after a socket buffer (skb) reallocation. An attacker could potentially exploit this to cause system instability or a denial of service. In some scenarios, this type of memory corruption could also lead to arbitrary code execution.

CWE-763 - Release of Invalid Pointer or Reference

A flaw was found in the Linux kernel's traffic control (TC) classifier application programming interface (API). The `tcf_qevent_handle` function does not properly handle a consumed socket buffer (`skb`) when it is processed by the defragmentation engine. This can lead to a Use-After-Free (UAF) vulnerability, where the system attempts to use memory that has already been freed. An attacker could potentially exploit this to cause system instability or execute arbitrary code.

CWE-431 - Missing Handler