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kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()

🗓️ 30 Jun 2026 11:30:57Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Linux kernel IPv6 tunnel error handling flaw lets remote ICMP version six errors overflow a stack buffer, risking crash or kernel code execution.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-43037
1 May 202614:15
–attackerkb
Tenable Nessus		Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1681)
9 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1695)
9 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1746)
27 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2026-118 (ALASKERNEL-5.10-2026-118)
9 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2026-102 (ALASKERNEL-5.15-2026-102)
9 May 202600:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel-rt (ALSA-2026:25120)
11 Jun 202600:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2026:25121)
11 Jun 202600:00
–nessus
Tenable Nessus		AlmaLinux 10 : kernel (ALSA-2026:25191)
11 Jun 202600:00
–nessus
Tenable Nessus		AlmaLinux 9 : kernel (ALSA-2026:25217)
11 Jun 202600:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10aarch64kernel6.12.0-231.12.el10nvkernel-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k6.12.0-231.12.el10nvkernel-64k-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-core6.12.0-231.12.el10nvkernel-64k-core-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debug6.12.0-231.12.el10nvkernel-64k-debug-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debug-core6.12.0-231.12.el10nvkernel-64k-debug-core-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debug-debuginfo6.12.0-231.12.el10nvkernel-64k-debug-debuginfo-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debug-modules6.12.0-231.12.el10nvkernel-64k-debug-modules-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debug-modules-core6.12.0-231.12.el10nvkernel-64k-debug-modules-core-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debug-modules-extra6.12.0-231.12.el10nvkernel-64k-debug-modules-extra-6.12.0-231.12.el10nv.aarch64.rpm
Red Hat Enterprise Linux10aarch64kernel-64k-debuginfo6.12.0-231.12.el10nvkernel-64k-debuginfo-6.12.0-231.12.el10nv.aarch64.rpm
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12 Jul 2026 10:44Current
7High risk
Vulners AI Score7
CVSS 3.19.8
EPSS0.00563
CWE-843
linux kernelipv6 tunnelerror handlingicmp version sixstack overflowkernel crashcode execution
4