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Amazon Linux AMI: CVE-2023-3609: Security patch for kernel (ALAS-2023-1792)

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Amazon Linux AMI: CVE-2023-3609: Security patch for kernel (ALAS-2023-1792)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
07/21/2023
Created
08/10/2023
Added
08/09/2023
Modified
08/09/2023

Description

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

If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.

We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2023-1792
  • CVE-2023-3609

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