Linux · Amazon Linux · Security advisory · April 27, 2026

ALAS2023-2026-1596: Security update for 22 packages

ALAS2023-2026-1596, released April 27, 2026, fixes 167 CVEs across 22 products. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent
CVEs closed
167
3 rated Critical
Exploited
0
None reported
Highest CVSS
9.8
Base score, 0 to 10
Highest EPSS
0.0159
75th percentile

Priority of the 167 CVEs

Patch now 0 Urgent 3 High 74 Routine 90

Fixed package versions

ProductReleaseFixed in
bpftool6.18amzn 20231:6.18.20-20.229.amzn2023
bpftool6.18-debuginfoamzn 20231:6.18.20-20.229.amzn2023
kernel-livepatch-6.18.20-20.229amzn 20231:1.0-0.amzn2023
kernel6.18amzn 20231:6.18.20-20.229.amzn2023
kernel6.18-debuginfoamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-debuginfo-common-aarch64amzn 20231:6.18.20-20.229.amzn2023
kernel6.18-debuginfo-common-x86_64amzn 20231:6.18.20-20.229.amzn2023
kernel6.18-develamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-headersamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-libbpfamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-libbpf-debuginfoamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-libbpf-develamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-libbpf-staticamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-modules-extraamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-modules-extra-commonamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-toolsamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-tools-debuginfoamzn 20231:6.18.20-20.229.amzn2023
kernel6.18-tools-develamzn 20231:6.18.20-20.229.amzn2023
perf6.18amzn 20231:6.18.20-20.229.amzn2023
perf6.18-debuginfoamzn 20231:6.18.20-20.229.amzn2023
python3-perf6.18amzn 20231:6.18.20-20.229.amzn2023
python3-perf6.18-debuginfoamzn 20231:6.18.20-20.229.amzn2023

CVEs this fix closes

PriorityCVETitleCVSSEPSSExploitation
Urgent CVE-2026-43402 linux: In the Linux kernel, the following vulnerability has been resolved: kthread: consolidate kthread exit paths to preve...9.8 0.0056 None reported
Urgent CVE-2026-43465 kernel-64kb: net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ (bsc#1264997).9.8 0.0054 None reported
Urgent CVE-2026-43384 kernel-64kb: net/tcp-ao: Fix MAC comparison to be constant-time (bsc#1265097).9.8 0.0046 None reported
High CVE-2026-23455 kernel: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero leng...9.1 0.0159 None reported
High CVE-2026-31402 kernel-64kb: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (bsc#1261638).9.8 0.0122 None reported
High CVE-2026-43407 kernel-64kb: libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply() (bsc#1265020).9.1 0.0066 None reported
High CVE-2026-43406 kernel-64kb: libceph: prevent potential out-of-bounds reads in process_message_header() (bsc#1265073).9.1 0.0061 None reported
High CVE-2026-43405 kernel-64kb: libceph: Use u32 for non-negative values in ceph_monmap_decode() (bsc#1264741).7.5 0.0060 None reported
High CVE-2026-43441 kernel-64kb: net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled (bsc#1264674).7.5 0.0059 None reported
High CVE-2026-43464 net/mlx5e: RX, Fix XDP multi-buf frag counting for legacy RQ7.5 0.0055 None reported
High CVE-2026-23456 kernel-64kb: netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case (bsc#1261703).8.2 0.0054 None reported
High CVE-2026-43383 kernel-64kb: net/tcp-md5: Fix MAC comparison to be constant-time (bsc#1264744).9.4 0.0054 None reported
High CVE-2026-43452 kernel-64kb: netfilter: x_tables: guard option walkers against 1-byte tail reads (bsc#1265142).8.2 0.0054 None reported
High CVE-2026-43365 kernel-64kb: xfs: fix undersized l_iclog_roundoff values (bsc#1265119).8.2 0.0051 None reported
High CVE-2026-23457 kernel-64kb: netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() (bsc#1261686).8.6 0.0045 None reported
High CVE-2026-43466 kernel-64kb: net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery (bsc#1264790).8.2 0.0041 None reported
High CVE-2026-43362 kernel-64kb: smb: client: fix in-place encryption corruption in SMB2_write() (bsc#1264989).8.1 0.0026 None reported
High CVE-2026-23278 netfilter: nf_tables: always walk all pending catchall elements7.8 0.0023 None reported
High CVE-2026-31788 kernel-livepatch-SLE15-SP7-RT_Update_11: xen/privcmd: restrict usage in unprivileged domU (bsc#1259707).8.2 0.0019 None reported
High CVE-2026-43456 kernel-64kb: bonding: fix type confusion in bond_setup_by_slave() (bsc#1264734).7.8 0.0019 None reported
High CVE-2026-23274 netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels7.8 0.0018 None reported
High CVE-2026-23272 netfilter: nf_tables: unconditionally bump set->nelems before insertion7.8 0.0018 None reported
High CVE-2026-23383 bpf, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearing7.8 0.0018 None reported
High CVE-2026-23392 netfilter: nf_tables: release flowtable after rcu grace period on error8.8 0.0017 None reported
High CVE-2026-43368 kernel-uek: ELSA-2026-50372: Unbreakable Enterprise kernel security update (IMPORTANT)8.8 0.0016 None reported
Showing 1 to 25 of 167 1Next

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