Red Hat Security Advisory: kernel security update

Moderate

In the Linux kernel, the following vulnerability has been resolved: spi: Fix null dereference on suspend A race condition exists where a synchronous (noqueue) transfer can be active during a system suspend. This can cause a null pointer dereference exception to occur when the system resumes. Example order of events leading to the exception: 1. spi_sync() calls __spi_transfer_message_noqueue() which sets ctlr->cur_msg 2. Spi transfer begins via spi_transfer_one_message() 3. System is suspended interrupting the transfer context 4. System is resumed 6. spi_controller_resume() calls spi_start_queue() which resets cur_msg to NULL 7. Spi transfer context resumes and spi_finalize_current_message() is called which dereferences cur_msg (which is now NULL) Wait for synchronous transfers to complete before suspending by acquiring the bus mutex and setting/checking a suspend flag.

CWE-476 - NULL Pointer Dereference

A failure flaw was found in the Linux kernel’s AMDGPU driver in how a user sends ioctl with an invalid address and size when using the AMD GPU. This flaw allows a local user to crash the system.

CWE-416 - Use After Free

A vulnerability was found in the ext4_mb_find_by_goal() function in the Linux kernel. This issue could lead to memory corruption or crashes due to the allocation of blocks from a group with a corrupted block bitmap.

CWE-229 - Improper Handling of Values