Improper input validation in Linux kernel - CVE-2026-64106

Vulnerability identifier: #VU138538

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64106

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper input validation in vgic_its_restore_dte() when restoring an ITS Device Table Entry. A remote user can supply a restored DTE with an out-of-range Size field to cause a denial of service.

Exploitation requires the ability to restore crafted KVM ITS device state on arm64 systems.

Linux kernel
openEuler
Ubuntu
kernel-debugsource
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules
linux-ibm (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-debugsource - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
python3-perf-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
python3-perf - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
perf - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-source - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
bpftool - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.3.29.160
kernel - addressed in versions 5.10.0-326.0.0.227, 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

• https://git.kernel.org/stable/c/0680f511926589206f81f57f76ce131d7741a316
• https://git.kernel.org/stable/c/1716b7fea2ead941a0dfac06c4504a3437cdf00d
• https://git.kernel.org/stable/c/8bcd15b690a390241179516af1b6ae49ebfd9d95
• https://git.kernel.org/stable/c/9ce754ed8e7ab4e3999767ce1505f85c449ccb07
• https://git.kernel.org/stable/c/b94538186a3eae3763b8f96dacd610920a865aa7
• https://git.kernel.org/stable/c/dab9f93251b2c86a033de6098d0c73afddd55d4a

• Improper input validation in Linux kernel kvm vgic
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• openEuler 22.03 LTS SP4 update for kernel
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia
• openEuler 24.03 LTS SP3 update for kernel