Vulmon
Amazon Linux 2 Security Advisory: ALASKERNEL-5.15-2023-027
Advisory Release Date: 2023-09-27 22:59 Pacific
Advisory Updated Date: 2023-10-06 00:18 Pacific
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. (CVE-2023-4623)
A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.
When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue().
We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8. (CVE-2023-4921)
Affected Packages:
kernel
Issue Correction:
Run yum update kernel to update your system.
aarch64:
kernel-5.15.133-86.144.amzn2.aarch64
kernel-headers-5.15.133-86.144.amzn2.aarch64
kernel-debuginfo-common-aarch64-5.15.133-86.144.amzn2.aarch64
perf-5.15.133-86.144.amzn2.aarch64
perf-debuginfo-5.15.133-86.144.amzn2.aarch64
python-perf-5.15.133-86.144.amzn2.aarch64
python-perf-debuginfo-5.15.133-86.144.amzn2.aarch64
kernel-tools-5.15.133-86.144.amzn2.aarch64
kernel-tools-devel-5.15.133-86.144.amzn2.aarch64
kernel-tools-debuginfo-5.15.133-86.144.amzn2.aarch64
bpftool-5.15.133-86.144.amzn2.aarch64
bpftool-debuginfo-5.15.133-86.144.amzn2.aarch64
kernel-devel-5.15.133-86.144.amzn2.aarch64
kernel-debuginfo-5.15.133-86.144.amzn2.aarch64
kernel-livepatch-5.15.133-86.144-1.0-0.amzn2.aarch64
i686:
kernel-headers-5.15.133-86.144.amzn2.i686
src:
kernel-5.15.133-86.144.amzn2.src
x86_64:
kernel-5.15.133-86.144.amzn2.x86_64
kernel-headers-5.15.133-86.144.amzn2.x86_64
kernel-debuginfo-common-x86_64-5.15.133-86.144.amzn2.x86_64
perf-5.15.133-86.144.amzn2.x86_64
perf-debuginfo-5.15.133-86.144.amzn2.x86_64
python-perf-5.15.133-86.144.amzn2.x86_64
python-perf-debuginfo-5.15.133-86.144.amzn2.x86_64
kernel-tools-5.15.133-86.144.amzn2.x86_64
kernel-tools-devel-5.15.133-86.144.amzn2.x86_64
kernel-tools-debuginfo-5.15.133-86.144.amzn2.x86_64
bpftool-5.15.133-86.144.amzn2.x86_64
bpftool-debuginfo-5.15.133-86.144.amzn2.x86_64
kernel-devel-5.15.133-86.144.amzn2.x86_64
kernel-debuginfo-5.15.133-86.144.amzn2.x86_64
kernel-livepatch-5.15.133-86.144-1.0-0.amzn2.x86_64