Red Hat Security Advisory: kernel security update

Moderate

An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

A vulnerability was found in the Linux kernel's hwmon subsystem, specifically in the mlxreg-fan driver. The issue arises when the driver’s sysfs interface for controlling fan speed does not properly handle cases where the requested minimum fan speed exceeds the maximum allowable value. When the value provided is out of bounds, it results in a non-zero return code that prevents updates to thermal statistics, which can lead to a slab-out-of-bounds error, potentially causing system instability or crashes due to improper access to memory.

CWE-754 - Improper Check for Unusual or Exceptional Conditions

A possible race condition flaw was found in the Linux kernel. When a process exits, its virtual memory areas (VMAs) are removed by exit_mmap(), and at the same time, userfaultfd_writeprotect() is called.

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

A flaw was found in unrestricted eBPF usage by the BPF_BTF_LOAD, leading to a possible out-of-bounds memory write in the Linux kernel’s BPF subsystem due to the way a user loads BTF. This flaw allows a local user to crash or escalate their privileges on the system.

CWE-787 - Out-of-bounds Write