ALAS2023-2026-3183

References: CVE-2026-89637  CVE-2026-89652  CVE-2026-93125  CVE-2026-98096 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

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

smb: client: fix UAF and buffer leak in cifs_check_trans2() for malformed secondary T2 (CVE-2026-89637)

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

ceph: bound copied dentry name length in NFS export get_name

ceph_get_name() copies the MDS-supplied name into the caller's
NAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)
and then writes name[rinfo->dname_len] = 0, without checking dname_len
against NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply
with dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies
rde->name / rde->name_len the same unchecked way.

Impact: a malicious or compromised Ceph MDS overflows the NAME_MAX name
buffer in a client's NFS-export get_name path, a slab out-of-bounds write
reported by KASAN. Reachable when a CephFS mount is re-exported over NFS.

Add ceph_export_copy_name(), which rejects lengths above NAME_MAX with
-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and
__get_snap_name(). (CVE-2026-89652)

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

bpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max (CVE-2026-93125)

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

ipv6: sr: restore network header before routing and forwarding (CVE-2026-98096)

Issue Correction:
Run dnf update kernel --releasever 2023.12.20261012 or dnf update --advisory ALAS2023-2026-3183 --releasever 2023.12.20261012 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:
    python3-perf-debuginfo-6.1.188-233.393.amzn2023.aarch64
    bpftool-6.1.188-233.393.amzn2023.aarch64
    perf-6.1.188-233.393.amzn2023.aarch64
    python3-perf-6.1.188-233.393.amzn2023.aarch64
    perf-debuginfo-6.1.188-233.393.amzn2023.aarch64
    kernel-headers-6.1.188-233.393.amzn2023.aarch64
    kernel-modules-extra-6.1.188-233.393.amzn2023.aarch64
    kernel-tools-6.1.188-233.393.amzn2023.aarch64
    bpftool-debuginfo-6.1.188-233.393.amzn2023.aarch64
    kernel-tools-debuginfo-6.1.188-233.393.amzn2023.aarch64
    kernel-debuginfo-6.1.188-233.393.amzn2023.aarch64
    kernel-tools-devel-6.1.188-233.393.amzn2023.aarch64
    kernel-modules-extra-common-6.1.188-233.393.amzn2023.aarch64
    kernel-livepatch-6.1.188-233.393-1.0-0.amzn2023.aarch64
    kernel-6.1.188-233.393.amzn2023.aarch64
    kernel-debuginfo-common-aarch64-6.1.188-233.393.amzn2023.aarch64
    kernel-devel-6.1.188-233.393.amzn2023.aarch64

src:
    kernel-6.1.188-233.393.amzn2023.src

x86_64:
    bpftool-debuginfo-6.1.188-233.393.amzn2023.x86_64
    kernel-livepatch-6.1.188-233.393-1.0-0.amzn2023.x86_64
    kernel-headers-6.1.188-233.393.amzn2023.x86_64
    perf-6.1.188-233.393.amzn2023.x86_64
    bpftool-6.1.188-233.393.amzn2023.x86_64
    kernel-modules-extra-common-6.1.188-233.393.amzn2023.x86_64
    kernel-tools-6.1.188-233.393.amzn2023.x86_64
    python3-perf-debuginfo-6.1.188-233.393.amzn2023.x86_64
    kernel-tools-devel-6.1.188-233.393.amzn2023.x86_64
    kernel-tools-debuginfo-6.1.188-233.393.amzn2023.x86_64
    kernel-debuginfo-6.1.188-233.393.amzn2023.x86_64
    perf-debuginfo-6.1.188-233.393.amzn2023.x86_64
    python3-perf-6.1.188-233.393.amzn2023.x86_64
    kernel-modules-extra-6.1.188-233.393.amzn2023.x86_64
    kernel-6.1.188-233.393.amzn2023.x86_64
    kernel-debuginfo-common-x86_64-6.1.188-233.393.amzn2023.x86_64
    kernel-devel-6.1.188-233.393.amzn2023.x86_64