vulnerability
Amazon Linux AMI 2: CVE-2023-4623: Security patch for kernel, kernel-livepatch-4.14.320-243.544, kernel-livepatch-4.14.322-244.536, kernel-livepatch-4.14.322-244.539, kernel-livepatch-4.14.322-246.539, kernel-livepatch-5.10.186-179.751, kernel-livepatch-5.10.192-182.736, kernel-livepatch-5.10.192-183.736 (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:L/Au:S/C:C/I:C/A:C) | Sep 6, 2023 | Oct 6, 2023 | Feb 20, 2025 |
Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
Sep 6, 2023
Added
Oct 6, 2023
Modified
Feb 20, 2025
Description
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.
If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.
We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
Solution(s)
amazon-linux-ami-2-upgrade-bpftoolamazon-linux-ami-2-upgrade-bpftool-debuginfoamazon-linux-ami-2-upgrade-kernelamazon-linux-ami-2-upgrade-kernel-debuginfoamazon-linux-ami-2-upgrade-kernel-debuginfo-common-aarch64amazon-linux-ami-2-upgrade-kernel-debuginfo-common-x86_64amazon-linux-ami-2-upgrade-kernel-develamazon-linux-ami-2-upgrade-kernel-headersamazon-linux-ami-2-upgrade-kernel-livepatch-4-14-320-243-544amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-320-243-544-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-536amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-536-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-539amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-539-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-246-539amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-246-539-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-4-14-326-245-539amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-186-179-751amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-186-179-751-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-5-10-192-182-736amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-192-182-736-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-5-10-192-183-736amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-192-183-736-debuginfoamazon-linux-ami-2-upgrade-kernel-livepatch-5-10-196-185-743amazon-linux-ami-2-upgrade-kernel-livepatch-5-15-133-86-144amazon-linux-ami-2-upgrade-kernel-toolsamazon-linux-ami-2-upgrade-kernel-tools-debuginfoamazon-linux-ami-2-upgrade-kernel-tools-develamazon-linux-ami-2-upgrade-perfamazon-linux-ami-2-upgrade-perf-debuginfoamazon-linux-ami-2-upgrade-python-perfamazon-linux-ami-2-upgrade-python-perf-debuginfo
References
- AMAZON-AL2/ALAS-2023-2264
- AMAZON-AL2/ALASKERNEL-5.10-2023-040
- AMAZON-AL2/ALASKERNEL-5.15-2023-027
- AMAZON-AL2/ALASKERNEL-5.4-2023-053
- AMAZON-AL2/ALASLIVEPATCH-2023-149
- AMAZON-AL2/ALASLIVEPATCH-2023-150
- AMAZON-AL2/ALASLIVEPATCH-2023-151
- AMAZON-AL2/ALASLIVEPATCH-2023-152
- AMAZON-AL2/ALASLIVEPATCH-2023-153
- AMAZON-AL2/ALASLIVEPATCH-2023-154
- AMAZON-AL2/ALASLIVEPATCH-2023-155
- CVE-2023-4623
- https://attackerkb.com/topics/CVE-2023-4623
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