CVE-2026-43079: Linux kernel · perf/x86/intel/uncore: Skip discovery table for offline dies
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f34feda8e0c9535fee3f8870ce8bab53c2798f71 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:18 UTC
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
Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/d18da11a5e21eac7651c8897e5e0908f6c2bc9de (opens in a new tab)
- git.kernel.org/stable/c/dfcba8c8674cead6c88a2f269b71aa4efd3d384a (opens in a new tab)
- git.kernel.org/stable/c/cfab2c817d2e7e0bee98d66850246ce842ed5f18 (opens in a new tab)
- git.kernel.org/stable/c/6cfc187d85f18f976d0fe527d4c6f6171542cc19 (opens in a new tab)
- git.kernel.org/stable/c/f34feda8e0c9535fee3f8870ce8bab53c2798f71 (opens in a new tab)
- git.kernel.org/stable/c/7a2cb02437d92ed14fe494d8994056d5bd2c72b4 (opens in a new tab)
- git.kernel.org/stable/c/7b568e9eba2fad89a696f22f0413d44cf4a1f892 (opens in a new tab)