---
id: CVE-2026-43079
title: 'perf/x86/intel/uncore: Skip discovery table for offline dies'
summary: |-
  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 …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    d18da11a5e21eac7651c8897e5e0908f6c2bc9de
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    dfcba8c8674cead6c88a2f269b71aa4efd3d384a
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    cfab2c817d2e7e0bee98d66850246ce842ed5f18
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    6cfc187d85f18f976d0fe527d4c6f6171542cc19
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    f34feda8e0c9535fee3f8870ce8bab53c2798f71
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    7a2cb02437d92ed14fe494d8994056d5bd2c72b4
  - >-
    Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <
    7b568e9eba2fad89a696f22f0413d44cf4a1f892
  - Linux 5.13
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:28:04.991226Z'
published: '2026-05-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:32:30.372Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43079'
references:
  - url: 'https://git.kernel.org/stable/c/d18da11a5e21eac7651c8897e5e0908f6c2bc9de'
  - url: 'https://git.kernel.org/stable/c/dfcba8c8674cead6c88a2f269b71aa4efd3d384a'
  - url: 'https://git.kernel.org/stable/c/cfab2c817d2e7e0bee98d66850246ce842ed5f18'
  - url: 'https://git.kernel.org/stable/c/6cfc187d85f18f976d0fe527d4c6f6171542cc19'
  - url: 'https://git.kernel.org/stable/c/f34feda8e0c9535fee3f8870ce8bab53c2798f71'
  - url: 'https://git.kernel.org/stable/c/7a2cb02437d92ed14fe494d8994056d5bd2c72b4'
  - url: 'https://git.kernel.org/stable/c/7b568e9eba2fad89a696f22f0413d44cf4a1f892'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02028
ingestedAt: '2026-11-06T15:54:04.025Z'
---

## Overview

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.

## Affected

- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < d18da11a5e21eac7651c8897e5e0908f6c2bc9de`
- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < dfcba8c8674cead6c88a2f269b71aa4efd3d384a`
- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < cfab2c817d2e7e0bee98d66850246ce842ed5f18`
- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < 6cfc187d85f18f976d0fe527d4c6f6171542cc19`
- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < f34feda8e0c9535fee3f8870ce8bab53c2798f71`
- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < 7a2cb02437d92ed14fe494d8994056d5bd2c72b4`
- `Linux >= edae1f06c2cda41edffc93de6aedc8ba8dc883c3 < 7b568e9eba2fad89a696f22f0413d44cf4a1f892`
- `Linux 5.13`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.