vulnerability

Amazon Linux AMI: CVE-2023-3776: Security patch for kernel (ALAS-2023-1792)

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
Jul 21, 2023
Added
Aug 9, 2023
Modified
May 21, 2025

Description

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



If tcf_change_indev() fails, fw_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 0323bce598eea038714f941ce2b22541c46d488f.

Solution

amazon-linux-upgrade-kernel
Title
NEW

Explore Exposure Command

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