Use of Out-of-range Pointer Offset in Linux kernel - CVE-2026-63924

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Main Vulnerability Database Vulnerabilities #VU138729

Use of Out-of-range Pointer Offset in Linux kernel - CVE-2026-63924

Published: July 20, 2026


Vulnerability identifier: #VU138729
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63924
CWE-ID: CWE-823
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper pointer handling in the IPv6 extension header parser in net/ipv6/exthdrs.c when processing IPv6 jumbo hop-by-hop options. A remote attacker can send a specially crafted IPv6 packet to cause a denial of service.


Affected software

Linux kernel
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME
SUSE Linux Enterprise Server 11
openEuler
Ubuntu
kernel-default-base
kernel-default-debugsource
kernel-ec2-debugsource
kernel-xen-debugsource
kernel-ec2-devel-debuginfo
kernel-trace-base
kernel-trace-debuginfo
kernel-xen-base
kernel-ec2-base
kernel-xen-devel-debuginfo
kernel-default-debuginfo
kernel-trace-devel
kernel-ec2
kernel-xen-devel
kernel-trace-debugsource
kernel-ec2-devel
kernel-default-devel
kernel-default-devel-debuginfo
kernel-xen-debuginfo
kernel-source
kernel-trace-devel-debuginfo
kernel-ec2-debuginfo
kernel-syms
kernel-trace
kernel-default
kernel-docs
kernel-xen
kernel-headers
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-extra-modules
linux-ibm (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-63924

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default-base - update to 3.0.101-108.216.1
kernel-default-debugsource - update to 3.0.101-108.216.1
kernel-ec2-debugsource - update to 3.0.101-108.216.1
kernel-xen-debugsource - update to 3.0.101-108.216.1
kernel-ec2-devel-debuginfo - update to 3.0.101-108.216.1
kernel-trace-base - update to 3.0.101-108.216.1
kernel-trace-debuginfo - update to 3.0.101-108.216.1
kernel-xen-base - update to 3.0.101-108.216.1
kernel-ec2-base - update to 3.0.101-108.216.1
kernel-xen-devel-debuginfo - update to 3.0.101-108.216.1
kernel-default-debuginfo - update to 3.0.101-108.216.1
kernel-trace-devel - update to 3.0.101-108.216.1
kernel-ec2 - update to 3.0.101-108.216.1
kernel-xen-devel - update to 3.0.101-108.216.1
kernel-trace-debugsource - update to 3.0.101-108.216.1
kernel-ec2-devel - update to 3.0.101-108.216.1
kernel-default-devel - update to 3.0.101-108.216.1
kernel-default-devel-debuginfo - update to 3.0.101-108.216.1
kernel-xen-debuginfo - update to 3.0.101-108.216.1
kernel-source - update to 3.0.101-108.216.1
kernel-trace-devel-debuginfo - update to 3.0.101-108.216.1
kernel-ec2-debuginfo - update to 3.0.101-108.216.1
kernel-syms - update to 3.0.101-108.216.1
kernel-trace - update to 3.0.101-108.216.1
kernel-default - update to 3.0.101-108.216.1
kernel-docs - update to 3.0.101-108.216.1
kernel-xen - update to 3.0.101-108.216.1
kernel-headers - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
bpftool - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-source - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
perf - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
python3-perf - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
python3-perf-debuginfo - addressed in versions 5.10.0-329.0.0.230, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins