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kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

🗓️ 17 Aug 2026 05:05:35Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Integer underflow in nf_conntrack_h323 DecodeQ931() causes OOB read from zero-length packet value.

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attackerkb
ATTACKERKB		CVE-2026-23455
3 Apr 202615:15
–attackerkb
nessus
Tenable Nessus		Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1594)
30 Apr 202600:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1596)
30 Apr 202600:00
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nessus
Tenable Nessus		Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1681)
9 May 202600:00
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nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2026-118 (ALASKERNEL-5.10-2026-118)
9 May 202600:00
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nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2026-102 (ALASKERNEL-5.15-2026-102)
9 May 202600:00
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nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0139: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2026:0139)
29 May 202600:00
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Tenable Nessus		AlmaLinux 9 : kernel (ALSA-2026:21556)
7 Jun 202600:00
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nessus
Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2026:21706)
28 May 202600:00
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Tenable Nessus		AlmaLinux 8 : kernel-rt (ALSA-2026:21745)
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10.0aarch64kernel6.12.0-55.98.1.el10_0kernel-6.12.0-55.98.1.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0ppc64lekernel6.12.0-55.98.1.el10_0kernel-6.12.0-55.98.1.el10_0.ppc64le.rpm
Red Hat Enterprise Linux10.0s390xkernel6.12.0-55.98.1.el10_0kernel-6.12.0-55.98.1.el10_0.s390x.rpm
Red Hat Enterprise Linux10.0x86_64kernel6.12.0-55.98.1.el10_0kernel-6.12.0-55.98.1.el10_0.x86_64.rpm
Red Hat Enterprise Linux10.0aarch64kernel-64k6.12.0-55.98.1.el10_0kernel-64k-6.12.0-55.98.1.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0aarch64kernel-64k-core6.12.0-55.98.1.el10_0kernel-64k-core-6.12.0-55.98.1.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0aarch64kernel-64k-debug6.12.0-55.98.1.el10_0kernel-64k-debug-6.12.0-55.98.1.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0aarch64kernel-64k-debug-core6.12.0-55.98.1.el10_0kernel-64k-debug-core-6.12.0-55.98.1.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0aarch64kernel-64k-debug-debuginfo6.12.0-55.98.1.el10_0kernel-64k-debug-debuginfo-6.12.0-55.98.1.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0aarch64kernel-64k-debug-devel6.12.0-55.98.1.el10_0kernel-64k-debug-devel-6.12.0-55.98.1.el10_0.aarch64.rpm
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19 Aug 2026 03:21Current
4.3Medium risk
Vulners AI Score4.3
CVSS 3.19.1
EPSS0.01338
CWE-125
nf_conntrack_h323integer underflowout-of-bounds readdenial of servicenetfilter subsystem
4