Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Important

A resource exhaustion vulnerability was found in the Kernel Same-page Merging (KSM) subsystem of the Linux kernel. When scanning processes with large sparse virtual memory mappings (e.g., 32 TiB with one mapped page), ksmd inefficiently walks every address rather than skipping unmapped holes. This causes ksmd to consume 100% CPU for extended periods.

CWE-606 - Unchecked Input for Loop Condition

A flaw was found in the Linux kernel's isofs filesystem. This vulnerability allows a local attacker, by mounting a specially crafted ISO image, to read data beyond the boundaries of the intended ISO 9660 volume. This out-of-bounds read could lead to information disclosure, potentially exposing sensitive data from adjacent filesystems on the same block device.

CWE-125 - Out-of-bounds Read

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