Unspecified impact via repeated PMU stop callbacks
Published Oct 28, 2026 · Updated Oct 28, 2026
Callback handling errors in Linux s390 PAI allow local users to cause unspecified impact through repeated performance-monitor stop calls. The pai_stop() function processes an already-stopped event again when sampling throttling is followed by task removal from the CPU. Exposure requires access to PAI performance events on s390; the published description does not specify the resulting security impact or required privileges.
Summary
What happened
Callback handling errors in Linux s390 PAI allow local users to cause unspecified impact through repeated performance-monitor stop calls. The pai_stop() function processes an already-stopped event again when sampling throttling is followed by task removal from the CPU. Exposure requires access to PAI performance events on s390; the published description does not specify the resulting security impact or required privileges.
The record
- CVE
- CVE-2026-99125
- Published
- Oct 28, 2026
- Updated
- Oct 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 28, 2026CVE publishedPublication date reported by the CVE source.
- Oct 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.11
- Affected versionversion=9f66572f2889a5e72a9d7e17787e52f03b1f7bd8 <cf348ec613f75b9774291e47b804fd7010835a6c
- Affected versionversion=9f66572f2889a5e72a9d7e17787e52f03b1f7bd8 <f3110e969ad226ffbb2d9b4bf5387e68d0d9ef40
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Get started to see how Hinoki identifies affected software and validates exploitability in your environment.
Contact us