NULL Pointer Dereference Affecting kernel-rt-devel package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (17th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTDEVEL-7237074
  • published10 Jun 2024
  • disclosed21 May 2024

Introduced: 21 May 2024

CVE-2023-52749  (opens in a new tab)
CWE-476  (opens in a new tab)
First added by Snyk

How to fix?

There is no fixed version for RHEL:8 kernel-rt-devel.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-devel package and not the kernel-rt-devel package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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
  5. spi_controller_resume() calls spi_start_queue() which resets cur_msg to NULL
  6. 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 Scores

version 3.1