Amazon Linux 2 (EOS) Security Advisory: ALAS2KERNEL-5.4-2026-131
Advisory Released Date: 2026-10-01
Advisory Updated Date: 2026-10-15
FAQs regarding Amazon Linux ALAS/CVE Severity
An issue in the Linux kernel's virtio-net/TAP networking path could allow an actor with privileged access inside a guest virtual machine to send specially crafted network packets that corrupt host kernel memory on KVM-based hypervisors running unpatched Linux kernel versions 4.4 through 6.18. This could result in disclosure of host memory or a denial of service.
In the Linux kernel, the following vulnerability has been resolved:
sctp: don't free the ASCONF's own transport in DEL-IP processing (CVE-2026-64564)
In the Linux kernel, the following vulnerability has been resolved:
net/sched: serialize qdisc_rtab_list against concurrent get/put (CVE-2026-68138)
In the Linux kernel, the following vulnerability has been resolved:
packet: use consistent hard_header_len in non-ring send paths (CVE-2026-74582)
In the Linux kernel, the following vulnerability has been resolved:
sctp: clear control chunk transport if it is being removed (CVE-2026-74688)
In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing checksum If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief. This was discovered and reported by Paulos, and has been reporoduced by others independently since. We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum. A more complete validation at input is forthcoming, but needs more work. (CVE-2026-99999)
Affected Packages:
kernel
Note:
This advisory is applicable to Amazon Linux 2 - Kernel-5.4 Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update kernel or yum update --advisory ALAS2KERNEL-5.4-2026-131 to update your system.
System reboot is required in order to complete this update.
aarch64:
kernel-5.4.302-229.498.amzn2.aarch64
kernel-headers-5.4.302-229.498.amzn2.aarch64
kernel-debuginfo-common-aarch64-5.4.302-229.498.amzn2.aarch64
perf-5.4.302-229.498.amzn2.aarch64
perf-debuginfo-5.4.302-229.498.amzn2.aarch64
python-perf-5.4.302-229.498.amzn2.aarch64
python-perf-debuginfo-5.4.302-229.498.amzn2.aarch64
kernel-tools-5.4.302-229.498.amzn2.aarch64
kernel-tools-devel-5.4.302-229.498.amzn2.aarch64
kernel-tools-debuginfo-5.4.302-229.498.amzn2.aarch64
bpftool-5.4.302-229.498.amzn2.aarch64
bpftool-debuginfo-5.4.302-229.498.amzn2.aarch64
kernel-devel-5.4.302-229.498.amzn2.aarch64
kernel-debuginfo-5.4.302-229.498.amzn2.aarch64
i686:
kernel-headers-5.4.302-229.498.amzn2.i686
src:
kernel-5.4.302-229.498.amzn2.src
x86_64:
kernel-5.4.302-229.498.amzn2.x86_64
kernel-headers-5.4.302-229.498.amzn2.x86_64
kernel-debuginfo-common-x86_64-5.4.302-229.498.amzn2.x86_64
perf-5.4.302-229.498.amzn2.x86_64
perf-debuginfo-5.4.302-229.498.amzn2.x86_64
python-perf-5.4.302-229.498.amzn2.x86_64
python-perf-debuginfo-5.4.302-229.498.amzn2.x86_64
kernel-tools-5.4.302-229.498.amzn2.x86_64
kernel-tools-devel-5.4.302-229.498.amzn2.x86_64
kernel-tools-debuginfo-5.4.302-229.498.amzn2.x86_64
bpftool-5.4.302-229.498.amzn2.x86_64
bpftool-debuginfo-5.4.302-229.498.amzn2.x86_64
kernel-devel-5.4.302-229.498.amzn2.x86_64
kernel-debuginfo-5.4.302-229.498.amzn2.x86_64
2026-10-15: CVE-2026-99999 was added to this advisory.