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VulnerabilityPublished Updated

CVE-2026-43079: Linux kernel · perf/x86/intel/uncore: Skip discovery table for offline dies

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f34feda8e0c9535fee3f8870ce8bab53c2798f71 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:18 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in f34feda8e0c9535fee3f8870ce8bab53c2798f71, dfcba8c8674cead6c88a2f269b71aa4efd3d384a, d18da11a5e21eac7651c8897e5e0908f6c2bc9de +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ edae1f06c2cda41edffc93de6aedc8ba8dc883c3, < f34feda8e0c9535fee3f8870ce8bab53c2798f71
Fixed in
  • f34feda8e0c9535fee3f8870ce8bab53c2798f71
LinuxLinuxAffected
  • ≥ edae1f06c2cda41edffc93de6aedc8ba8dc883c3, < dfcba8c8674cead6c88a2f269b71aa4efd3d384a
Fixed in
  • dfcba8c8674cead6c88a2f269b71aa4efd3d384a
LinuxLinuxAffected
  • ≥ edae1f06c2cda41edffc93de6aedc8ba8dc883c3, < d18da11a5e21eac7651c8897e5e0908f6c2bc9de
Fixed in
  • d18da11a5e21eac7651c8897e5e0908f6c2bc9de
LinuxLinuxAffected
  • ≥ edae1f06c2cda41edffc93de6aedc8ba8dc883c3, < cfab2c817d2e7e0bee98d66850246ce842ed5f18
Fixed in
  • cfab2c817d2e7e0bee98d66850246ce842ed5f18
LinuxLinuxAffected
  • ≥ edae1f06c2cda41edffc93de6aedc8ba8dc883c3, < 7b568e9eba2fad89a696f22f0413d44cf4a1f892
Fixed in
  • 7b568e9eba2fad89a696f22f0413d44cf4a1f892
LinuxLinuxAffected
  • ≥ edae1f06c2cda41edffc93de6aedc8ba8dc883c3, < 7a2cb02437d92ed14fe494d8994056d5bd2c72b4
Fixed in
  • 7a2cb02437d92ed14fe494d8994056d5bd2c72b4

AI-suggested

A fix is available and has been applied in specific Linux kernel commits. Users should update to a Linux kernel version that includes these fixes to remediate the vulnerability.

Description

A vulnerability in the Linux kernel's perf subsystem for Intel uncore PMUs was fixed. The issue occurs when the system boots with fewer CPUs than expected in die 0 and NUMA is disabled, causing the discovery table to be parsed for offline dies. This can lead to an array overflow in the uncore_pci_pmu_register function, potentially triggering warnings or other issues.

References

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