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Oracle Linux: CVE-2023-52439: ELSA-2024-6997: kernel security update (IMPORTANT) (Multiple Advisories)

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Oracle Linux: CVE-2023-52439: ELSA-2024-6997:kernel security update (IMPORTANT) (Multiple Advisories)

Severity
6
CVSS
(AV:L/AC:H/Au:S/C:C/I:C/A:C)
Published
02/20/2024
Created
06/07/2024
Added
06/06/2024
Modified
01/07/2025

Description

In the Linux kernel, the following vulnerability has been resolved: uio: Fix use-after-free in uio_open core-1core-2 ------------------------------------------------------- uio_unregister_deviceuio_open idev = idr_find() device_unregister(&idev->dev) put_device(&idev->dev) uio_device_release get_device(&idev->dev) kfree(idev) uio_free_minor(minor) uio_release put_device(&idev->dev) kfree(idev) ------------------------------------------------------- In the core-1 uio_unregister_device(), the device_unregister will kfree idev when the idev->dev kobject ref is 1. But after core-1 device_unregister, put_device and before doing kfree, the core-2 may get_device. Then: 1. After core-1 kfree idev, the core-2 will do use-after-free for idev. 2. When core-2 do uio_release and put_device, the idev will be double freed. To address this issue, we can get idev atomic & inc idev reference with minor_lock. A flaw was found in the Linux kernel’s uio subsystem. A use-after-free memory flaw in the uio_open functionality allows a local user to crash or escalate their privileges on the system.

Solution(s)

  • oracle-linux-upgrade-kernel

References

  • https://attackerkb.com/topics/cve-2023-52439
  • CVE - 2023-52439
  • ELSA-2024-6997
  • ELSA-2024-3618
  • 查看数 708
  • 已创建
  • 最后回复

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