Answer in brief
CVE-2026-23271 records a High severity (CVSS 7.8) vulnerability in perf: Fix __perf_event_overflow() vs perf_remove_from_context() race. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-23271 records a High severity (CVSS 7.8) vulnerability in perf: Fix __perf_event_overflow() vs perf_remove_from_context() race. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=592903cdcbf606a838056bae6d03fc557806c914 <4df1a45819e50993cb351682a6ae8e7ed2d233a0 || >=592903cdcbf606a838056bae6d03fc557806c914 <4f8d5812337871227bb2c98669a87c306a2f86ef || >=592903cdcbf606a838056bae6d03fc557806c914 <5c48fdc4b4623533d86e279f51531a7ba212eb87 || >=592903cdcbf606a838056bae6d03fc557806c914 <3f89b61dd504c5b6711de9759e053b082f9abf12 || >=592903cdcbf606a838056bae6d03fc557806c914 <bb190628fe5f2a73ba762a9972ba16c5e895f73e || >=592903cdcbf606a838056bae6d03fc557806c914 <c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae | 4df1a45819e50993cb351682a6ae8e7ed2d233a0, 4f8d5812337871227bb2c98669a87c306a2f86ef, 5c48fdc4b4623533d86e279f51531a7ba212eb87, 3f89b61dd504c5b6711de9759e053b082f9abf12, bb190628fe5f2a73ba762a9972ba16c5e895f73e, c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Mar 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race Make sure that __perf_event_overflow() runs with IRQs disabled for all possible callchains. Specifically the software events can end up running it with only preemption disabled. This opens up a race vs perf_event_exit_event() and friends that will go and free various things the overflow path expects to be present, like the BPF program.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=592903cdcbf606a838056bae6d03fc557806c914 <4df1a45819e50993cb351682a6ae8e7ed2d233a0 || >=592903cdcbf606a838056bae6d03fc557806c914 <4f8d5812337871227bb2c98669a87c306a2f86ef || >=592903cdcbf606a838056bae6d03fc557806c914 <5c48fdc4b4623533d86e279f51531a7ba212eb87 || >=592903cdcbf606a838056bae6d03fc557806c914 <3f89b61dd504c5b6711de9759e053b082f9abf12 || >=592903cdcbf606a838056bae6d03fc557806c914 <bb190628fe5f2a73ba762a9972ba16c5e895f73e || >=592903cdcbf606a838056bae6d03fc557806c914 <c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae | 4df1a45819e50993cb351682a6ae8e7ed2d233a0, 4f8d5812337871227bb2c98669a87c306a2f86ef, 5c48fdc4b4623533d86e279f51531a7ba212eb87, 3f89b61dd504c5b6711de9759e053b082f9abf12, bb190628fe5f2a73ba762a9972ba16c5e895f73e, c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Mar 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race Make sure that __perf_event_overflow() runs with IRQs disabled for all possible callchains. Specifically the software events can end up running it with only preemption disabled. This opens up a race vs perf_event_exit_event() and friends that will go and free various things the overflow path expects to be present, like the BPF program.
Quoted source text, attributed separately from HOL analysis.