CVE-2023-52749

Description

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.

CVSS Metrics

• v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 3%

Techniques & Countermeasures

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

  The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

• CWE-476•NULL Pointer Dereference

  The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

• linux•linux

  ≥ ae7d2346dc89ae89a6e0aabe6037591a11e593c0, < 4ec4508db97502a12daee88c74782e8d35ced068 | ≥ ae7d2346dc89ae89a6e0aabe6037591a11e593c0, < 96474ea47dc67b0704392d59192b233c8197db0e | ≥ ae7d2346dc89ae89a6e0aabe6037591a11e593c0, < bef4a48f4ef798c4feddf045d49e53c8a97d5e37 | 6.0

• linux•linux_kernel

  < 6.1.66 | ≥ 6.2, < 6.6.3

References (3)

• https://git.kernel.org/stable/c/4ec4508db97502a12daee88c74782e8d35ced068
• https://git.kernel.org/stable/c/96474ea47dc67b0704392d59192b233c8197db0e
• https://git.kernel.org/stable/c/bef4a48f4ef798c4feddf045d49e53c8a97d5e37