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Oracle Linux: CVE-2023-52492: ELSA-2024-8856: kernel security update (MODERATE) (Multiple Advisories)

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Oracle Linux: CVE-2023-52492: ELSA-2024-8856:kernel security update (MODERATE) (Multiple Advisories)

Severity
4
CVSS
(AV:L/AC:L/Au:M/C:N/I:N/A:C)
Published
02/29/2024
Created
11/13/2024
Added
11/11/2024
Modified
01/07/2025

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: fix NULL pointer in channel unregistration function __dma_async_device_channel_register() can fail. In case of failure, chan->local is freed (with free_percpu()), and chan->local is nullified. When dma_async_device_unregister() is called (because of managed API or intentionally by DMA controller driver), channels are unconditionally unregistered, leading to this NULL pointer: [1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0 [...] [1.484499] Call trace: [1.486930]device_del+0x40/0x394 [1.490314]device_unregister+0x20/0x7c [1.494220]__dma_async_device_channel_unregister+0x68/0xc0 Look at dma_async_device_register() function error path, channel device unregistration is done only if chan->local is not NULL. Then add the same condition at the beginning of __dma_async_device_channel_unregister() function, to avoid NULL pointer issue whatever the API used to reach this function.

Solution(s)

  • oracle-linux-upgrade-kernel

References

  • https://attackerkb.com/topics/cve-2023-52492
  • CVE - 2023-52492
  • ELSA-2024-8856
  • 查看数 704
  • 已创建
  • 最后回复

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