Red Hat Security Advisory: kernel security update

Important

A flaw was found in the Linux kernel's `pcrypt` component. This vulnerability involves how the system handles certain requests, specifically `MAY_BACKLOG` requests, which can indicate a temporary busy state. If not properly managed, the system's processing of these requests could lead to resource exhaustion or instability.

CWE-770 - Allocation of Resources Without Limits or Throttling

A flaw was found in the Linux kernel's netfilter conntrack module. This vulnerability arises from the use of `sprintf` and insufficient buffer sizing in the `mangle_content_len()` function, which can lead to a stack-out-of-bounds write. An attacker could potentially exploit this memory corruption issue to cause a denial of service or other unspecified impacts.

CWE-787 - Out-of-bounds Write

A flaw was found in the Linux kernel's netfilter synproxy module. When handling TCP timestamp options, a stale pointer can be used after memory reallocation. This can result in memory corruption, where data is written to a freed memory area, or lead to packets being sent with an incorrect checksum. A remote attacker could potentially exploit this to cause system instability or network communication issues.

CWE-825 - Expired Pointer Dereference

A flaw was found in the Linux kernel. This vulnerability, known as a use-after-free, occurs in the `rhashtable` component when the system improperly handles hash table restarts. An attacker could potentially exploit this by causing the system to access memory that has already been released, which may lead to a system crash (Denial of Service) or, in more severe scenarios, allow for unauthorized code execution or information disclosure.

CWE-825 - Expired Pointer Dereference

A flaw was found in the Linux kernel's Server Message Block (SMB) client. A remote attacker could send a specially crafted SMB response containing a malformed Distributed File System (DFS) referral. This could cause the PathConsumed value to exceed the search name length, leading to an out-of-bounds read during DFS path parsing. This vulnerability may result in information disclosure or a denial of service.

CWE-805 - Buffer Access with Incorrect Length Value

A flaw was found in the `nvmet-rdma` component of the Linux kernel. This vulnerability arises from incorrect handling of inline data with a non-zero offset, which can lead to an integer underflow. An attacker could exploit this to cause the system to read beyond its allocated memory, potentially resulting in an out-of-bounds read. This could lead to a denial of service or the disclosure of sensitive information.

CWE-125 - Out-of-bounds Read