ALASKERNEL-5.4-2023-053

A flaw was found in the Linux kernel's IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to directly dereference a NULL pointer in xfrm_update_ae_params(), leading to a possible kernel crash and denial of service. (CVE-2023-3772)

The upstream commit describes this issue as follows:

The missing IP_SET_HASH_WITH_NET0 macro in ip_set_hash_netportnet can lead to the use of wrong `CIDR_POS(c)` for calculating array offsets, which can lead to integer underflow. As a result, it leads to slab out-of-bound access. (CVE-2023-42753)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c. (CVE-2023-4622)

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)

aarch64:
    kernel-5.4.257-170.359.amzn2.aarch64
    kernel-headers-5.4.257-170.359.amzn2.aarch64
    kernel-debuginfo-common-aarch64-5.4.257-170.359.amzn2.aarch64
    perf-5.4.257-170.359.amzn2.aarch64
    perf-debuginfo-5.4.257-170.359.amzn2.aarch64
    python-perf-5.4.257-170.359.amzn2.aarch64
    python-perf-debuginfo-5.4.257-170.359.amzn2.aarch64
    kernel-tools-5.4.257-170.359.amzn2.aarch64
    kernel-tools-devel-5.4.257-170.359.amzn2.aarch64
    kernel-tools-debuginfo-5.4.257-170.359.amzn2.aarch64
    bpftool-5.4.257-170.359.amzn2.aarch64
    bpftool-debuginfo-5.4.257-170.359.amzn2.aarch64
    kernel-devel-5.4.257-170.359.amzn2.aarch64
    kernel-debuginfo-5.4.257-170.359.amzn2.aarch64

i686:
    kernel-headers-5.4.257-170.359.amzn2.i686

src:
    kernel-5.4.257-170.359.amzn2.src

x86_64:
    kernel-5.4.257-170.359.amzn2.x86_64
    kernel-headers-5.4.257-170.359.amzn2.x86_64
    kernel-debuginfo-common-x86_64-5.4.257-170.359.amzn2.x86_64
    perf-5.4.257-170.359.amzn2.x86_64
    perf-debuginfo-5.4.257-170.359.amzn2.x86_64
    python-perf-5.4.257-170.359.amzn2.x86_64
    python-perf-debuginfo-5.4.257-170.359.amzn2.x86_64
    kernel-tools-5.4.257-170.359.amzn2.x86_64
    kernel-tools-devel-5.4.257-170.359.amzn2.x86_64
    kernel-tools-debuginfo-5.4.257-170.359.amzn2.x86_64
    bpftool-5.4.257-170.359.amzn2.x86_64
    bpftool-debuginfo-5.4.257-170.359.amzn2.x86_64
    kernel-devel-5.4.257-170.359.amzn2.x86_64
    kernel-debuginfo-5.4.257-170.359.amzn2.x86_64