CVE-2026-43079 perf/x86/intel/uncore: Skip discovery table for offline dies
An attacker with local access can trigger an array overflow in the Linux kernel's Intel uncore driver by booting with specific CPU configurations, causing a system crash.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43079?
CVE-2026-43079 is a medium-severity vulnerability in Linux kernel, published on 6 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/intel/uncore: Skip discovery table for offline dies
This warning can be triggered if NUMA is disabled and the system boots with fewer CPUs than the number of CPUs in die 0.
WARNING: CPU: 9 PID: 7257 at uncore.c:1157 uncore_pci_pmu_register+0x136/0x160 [intel_uncore]
Currently, the discovery table continues to be parsed even if all CPUs in the associated die are offline. This can lead to an array overflow at "pmu->boxes[die] = box" in uncore_pci_pmu_register(), which may trigger the warning above or cause other issues.
Which versions are affected by CVE-2026-43079?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43079?
Apply the vendor's patch.
Is CVE-2026-43079 being exploited?
There is no known exploitation of CVE-2026-43079 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43079, DEBIAN-CVE-2026-43079, GHSA-92q7-4p9m-x698, ROOT-OS-DEBIAN-12-CVE-2026-43079, ROOT-OS-UBUNTU-2204-CVE-2026-43079, ROOT-OS-UBUNTU-2404-CVE-2026-43079 and 1 more.