CVE-2026-23456

linux: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in de...

CVE-2026-23456 is fixed in 112 products on 1 platform, first by DEBIAN-CVE-2026-23456, released April 3, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
8.2
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0054
45th percentile

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case In decode_int(), the CONS case calls get_bits(bs, 2) to read a length value, then calls get_uint(bs, len) without checking that len bytes remain in the buffer. The existing boundary check only validates the 2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint() reads. This allows a malformed H.323/RAS packet to cause a 1-4 byte slab-out-of-bounds read. Add a boundary check for len bytes after get_bits() and before get_uint().

Where it's fixed

ProductFixed inFixReleased
Linux
bpftool · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
bpftool-debuginfo · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
bpftool6.12 · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
bpftool6.12-debuginfo · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
bpftool6.18 · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
bpftool6.18-debuginfo · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-64kb · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-azure · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-debuginfo · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-debuginfo-common-aarch64 · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-debuginfo-common-x86_64 · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-default · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-default-base · sles 15.7 6.4.0-150700.53.55.1.150700.17.33.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-devel · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-docs · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-headers · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-libbpf · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-libbpf-debuginfo · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-libbpf-devel · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-libbpf-static · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-livepatch-6.1.168-202.320 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-livepatch-6.12.79-101.147 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel-livepatch-6.18.20-20.229 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel-livepatch-SLE15-SP7_Update_15 · sles 15.7 1-150700.15.3.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-modules-extra · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-modules-extra-common · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-obs-build · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-source · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-syms · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel-tools · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-tools-debuginfo · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-tools-devel · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
kernel-uek · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-devel · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-devel · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-deprecated · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-deprecated · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-desktop · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-desktop · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra-netfilter · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra-netfilter · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-usb · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-usb · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-wireless · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-wireless · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-devel · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-devel · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-doc · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-doc · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-deprecated · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-deprecated · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-desktop · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-desktop · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra-netfilter · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra-netfilter · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-usb · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-usb · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-wireless · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-wireless · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-tools · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-tools · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-devel · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-devel · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-deprecated · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-deprecated · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-desktop · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-desktop · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra-netfilter · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra-netfilter · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-usb · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-usb · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-wireless · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-wireless · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-zfcpdump · sles 15.7 6.4.0-150700.53.55.1 SUSE-SU-2026:2238-1 Jun 30, 2026
kernel6.12 · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-debuginfo · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-debuginfo-common-aarch64 · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-debuginfo-common-x86_64 · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-devel · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-headers · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-libbpf · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-libbpf-debuginfo · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-libbpf-devel · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-libbpf-static · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-modules-extra · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-modules-extra-common · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-tools · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-tools-debuginfo · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.12-tools-devel · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
kernel6.18 · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-debuginfo · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-debuginfo-common-aarch64 · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-debuginfo-common-x86_64 · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-devel · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-headers · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-libbpf · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-libbpf-debuginfo · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-libbpf-devel · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-libbpf-static · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-modules-extra · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-modules-extra-common · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-tools · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-tools-debuginfo · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
kernel6.18-tools-devel · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
linux · Debian 12.15 (bookworm) 6.1.170-1 DEBIAN-CVE-2026-23456 Apr 3, 2026
linux · Debian 13.5 (trixie) 6.12.85-1 DEBIAN-CVE-2026-23456 Apr 3, 2026
linux · Debian 14 6.19.10-1 DEBIAN-CVE-2026-23456 Apr 3, 2026
perf · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
perf-debuginfo · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
perf6.12 · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
perf6.12-debuginfo · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
perf6.18 · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
perf6.18-debuginfo · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
python3-perf · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
python3-perf-debuginfo · amzn 2023 1:6.1.168-202.320.amzn2023 ALAS2023-2026-1681 May 11, 2026
python3-perf6.12 · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
python3-perf6.12-debuginfo · amzn 2023 1:6.12.79-101.147.amzn2023 ALAS2023-2026-1594 Apr 27, 2026
python3-perf6.18 · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026
python3-perf6.18-debuginfo · amzn 2023 1:6.18.20-20.229.amzn2023 ALAS2023-2026-1596 Apr 27, 2026

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