CVE-2026-97526: Linux kernel · s390/pai: Support CPU hotplug for PMU PAI
Affects Linux kernelSource CVE Database V5
Not known to be exploited : upgrade to 706e2bf330144995d123dccf32aaf1981ce5abc2 or 9ecc4d033879f7761f2df07e20cd2fbec00fd90b soon.
Data as of 26 Oct 2026, 17:16 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 706e2bf330144995d123dccf32aaf1981ce5abc2, 9ecc4d033879f7761f2df07e20cd2fbec00fd90b
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
Upgrade Linux kernel to 706e2bf330144995d123dccf32aaf1981ce5abc2 or 9ecc4d033879f7761f2df07e20cd2fbec00fd90b.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A patch is available and has been applied in the Linux kernel commits 706e2bf330144995d123dccf32aaf1981ce5abc2 and 9ecc4d033879f7761f2df07e20cd2fbec00fd90b. Users should update to the fixed Linux kernel version 6.11 or later containing these commits to resolve the issue. Since this is a kernel-level fix, applying the official kernel update is the recommended remediation.
Description
A vulnerability in the Linux kernel's s390/pai subsystem caused kernel crashes when CPUs were hotplugged during a perf stat command execution. The issue was due to missing per-CPU data structure allocation for newly added CPUs, leading to a NULL pointer dereference and kernel panic. The fix adds CPU hotplug support to properly allocate these data structures during CPU offline state, preventing crashes when CPUs are brought online.