Answer in brief
CVE-2026-64558 records a Unknown severity vulnerability in s390/pkey: Check length in pkey_pckmo handler implementation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <02028a24e26d85262ab9c8fc4344e1f3503007fc || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <433e5e70cdc1edf382d28d08a885b22e2b98b7da || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <614aa0491c7a190556c2345dddee0b6f5ed90989 || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <1ac287e2af9a9112fe271427ef45eceb26bce8b4 | 02028a24e26d85262ab9c8fc4344e1f3503007fc, 433e5e70cdc1edf382d28d08a885b22e2b98b7da, 614aa0491c7a190556c2345dddee0b6f5ed90989, 1ac287e2af9a9112fe271427ef45eceb26bce8b4 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Jul 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64558 records a Unknown severity vulnerability in s390/pkey: Check length in pkey_pckmo handler implementation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <02028a24e26d85262ab9c8fc4344e1f3503007fc || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <433e5e70cdc1edf382d28d08a885b22e2b98b7da || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <614aa0491c7a190556c2345dddee0b6f5ed90989 || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <1ac287e2af9a9112fe271427ef45eceb26bce8b4 | 02028a24e26d85262ab9c8fc4344e1f3503007fc, 433e5e70cdc1edf382d28d08a885b22e2b98b7da, 614aa0491c7a190556c2345dddee0b6f5ed90989, 1ac287e2af9a9112fe271427ef45eceb26bce8b4 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Jul 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.
Quoted source text, attributed separately from HOL analysis.