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

Important

A use-after-free vulnerability was found in the Linux kernel's seqiv (Sequence IV) crypto module. After calling crypto_aead_encrypt(), the underlying request may be freed by asynchronous completion handlers. The code then incorrectly dereferences req->iv to compare against info, accessing potentially freed memory. This can cause memory corruption or crashes when using asynchronous AEAD encryption.

CWE-825 - Expired Pointer Dereference

A flaw was found in the Linux kernel's SELinux security module when handling overlayfs. The existing security model for overlayfs does not properly enforce access controls for `mmap()` and `mprotect()` operations. This oversight could allow a local attacker to bypass intended security policies, potentially leading to unauthorized access to files within an overlayfs filesystem. The vulnerability is resolved by enhancing backing file enforcement for `mmap()` and leveraging new LSM (Linux Security Module) capabilities for `mprotect()` access controls.

CWE-280 - Improper Handling of Insufficient Permissions or Privileges

A flaw was found in the Linux kernel. Specifically, within the `drm/xe` graphics driver, two error handling issues in the `xe_exec_queue_create_ioctl()` function could lead to memory corruption. This could result in a dangling pointer or a use-after-free vulnerability. A local attacker could potentially exploit these issues to cause a system crash (denial of service) or gain elevated privileges.

CWE-825 - Expired Pointer Dereference