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Amazon Linux AMI: CVE-2023-4207: Security patch for kernel (ALAS-2023-1838)

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Amazon Linux AMI: CVE-2023-4207: Security patch for kernel (ALAS-2023-1838)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
09/06/2023
Created
10/11/2023
Added
10/07/2023
Modified
10/07/2023

Description

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

When fw_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 76e42ae831991c828cffa8c37736ebfb831ad5ec.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2023-1838
  • CVE-2023-4207

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