ALAS2023-2026-1938

Amazon Linux 2023 Security Advisory: ALAS2023-2026-1938
Advisory Released Date: 2026-07-07
Advisory Updated Date: 2026-07-07

Severity: Important

References:
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

In the Linux kernel, the following vulnerability has been resolved:

net: fix fraggap accounting error in IPv4/IPv6 paged-allocation fragmentation paths

A fraggap accounting error in __ip6_append_data() and __ip_append_data() causes a heap buffer overflow (8-15 bytes) into the skb_shared_info structure at the tail of a packet's own head object. This allows an unprivileged local user, including from within unprivileged user namespaces and containers, to achieve privilege escalation, arbitrary code execution, container escape, denial of service, or information disclosure.

Affected Packages:

kernel6.18

Issue Correction:
Run dnf update kernel6.18 --releasever 2023.12.20260706 or dnf update --advisory ALAS2023-2026-1938 --releasever 2023.12.20260706 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    microvm-kernel6.18-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-tools-devel-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-tools-debuginfo-6.18.36-69.136.amzn2023.aarch64
    bpftool6.18-debuginfo-6.18.36-69.136.amzn2023.aarch64
    python3-perf6.18-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-modules-extra-6.18.36-69.136.amzn2023.aarch64
    kernel-livepatch-6.18.36-69.136-1.0-0.amzn2023.aarch64
    bpftool6.18-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-headers-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-modules-extra-common-6.18.36-69.136.amzn2023.aarch64
    python3-perf6.18-debuginfo-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-tools-6.18.36-69.136.amzn2023.aarch64
    perf6.18-debuginfo-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-debuginfo-6.18.36-69.136.amzn2023.aarch64
    perf6.18-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-debuginfo-common-aarch64-6.18.36-69.136.amzn2023.aarch64
    kernel6.18-devel-6.18.36-69.136.amzn2023.aarch64

src:
    kernel6.18-6.18.36-69.136.amzn2023.src

x86_64:
    perf6.18-debuginfo-6.18.36-69.136.amzn2023.x86_64
    perf6.18-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-headers-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-debuginfo-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-debuginfo-common-x86_64-6.18.36-69.136.amzn2023.x86_64
    bpftool6.18-debuginfo-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-tools-debuginfo-6.18.36-69.136.amzn2023.x86_64
    bpftool6.18-6.18.36-69.136.amzn2023.x86_64
    python3-perf6.18-debuginfo-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-tools-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-tools-devel-6.18.36-69.136.amzn2023.x86_64
    kernel-livepatch-6.18.36-69.136-1.0-0.amzn2023.x86_64
    python3-perf6.18-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-modules-extra-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-modules-extra-common-6.18.36-69.136.amzn2023.x86_64
    microvm-kernel6.18-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-6.18.36-69.136.amzn2023.x86_64
    kernel6.18-devel-6.18.36-69.136.amzn2023.x86_64

Additional References

Release Notes: Amazon Linux 2023 Release Notes

Red Hat:

Mitre: