Amazon Linux 2023 Security Advisory: ALAS2023LIVEPATCH-2023-013
Advisory Released Date: 2023-10-23
Advisory Updated Date: 2023-10-23
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. (CVE-2023-3609)
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. (CVE-2023-3776)
Affected Packages:
kernel-livepatch-6.1.34-58.102
Issue Correction:
Please ensure you have live patching enabled. Run dnf update kernel-livepatch-6.1.34-58.102 --releasever latest or dnf update --advisory ALAS2023LIVEPATCH-2023-013 --releasever latest to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
kernel-livepatch-6.1.34-58.102-1.0-1.amzn2023.aarch64
src:
kernel-livepatch-6.1.34-58.102-1.0-1.amzn2023.src
x86_64:
kernel-livepatch-6.1.34-58.102-1.0-1.amzn2023.x86_64