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Amazon Linux AMI: CVE-2023-4208: Security patch for kernel (ALAS-2023-1827)

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Amazon Linux AMI: CVE-2023-4208: Security patch for kernel (ALAS-2023-1827)

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
09/06/2023
Created
10/05/2023
Added
10/04/2023
Modified
01/28/2025

Description

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2023-1827
  • CVE-2023-4208
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