Race condition in Linux kernel - CVE-2026-45944

Vulnerability identifier: #VU132549

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-45944

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a race condition in the Intel VT-d IOMMU context entry teardown logic when tearing down context entries. A local attacker can trigger use of a torn context entry to cause a denial of service.

The issue arises because the hardware may observe a partially updated 128-bit context entry while the Present bit remains set, resulting in unpredictable behavior or spurious faults.

Linux kernel
Debian Linux
openEuler
Ubuntu
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-realtime (Ubuntu package)
linux-fips (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
python3-perf-debuginfo
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
kernel-source
kernel-extra-modules
linux-nvidia-tegra (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 6.8.0-147.147
linux-lowlatency (Ubuntu package) - update to 6.8.0-147.147.1
linux-gcp (Ubuntu package) - update to 6.8.0-1071.79
linux-aws (Ubuntu package) - update to 6.8.0-1067.70
linux-ibm (Ubuntu package) - update to 6.8.0-1067.68
linux-oracle (Ubuntu package) - update to 6.8.0-1064.67
linux-realtime (Ubuntu package) - update to 6.8.1-1062.63
linux-fips (Ubuntu package) - update to 6.8.0-147.147+fips1
linux-gkeop (Ubuntu package) - update to 6.8.0-1052.56
linux-gke (Ubuntu package) - update to 6.8.0-1066.74
linux-aws-fips (Ubuntu package) - update to 6.8.0-1067.70+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1071.79+fips1
python3-perf-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
bpftool - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
bpftool-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-debugsource - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-devel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-headers - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-tools - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-tools-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-tools-devel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
perf - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
perf-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
python3-perf - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-source - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153, 6.6.0-145.3.15.146
kernel-extra-modules - update to 6.6.0-145.3.15.146
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
linux (Debian package) - update to 6.12.100-1

• https://git.kernel.org/stable/c/a922dbafb4a674d958d702038232d09a30daf770
• https://git.kernel.org/stable/c/c1e4f1dccbe9d7656d1c6872ebeadb5992d0aaa2
• https://git.kernel.org/stable/c/d2138abc8f0a7fce4101b7229b43b06811ed083d

• Race condition in Linux kernel iommu intel driver
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• openEuler 22.03 LTS SP4 update for kernel
• Debian update for linux
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux, linux-aws, linux-aws-fips and more