Answer in brief
CVE-2026-64559 records a Unknown severity vulnerability in s390/pkey: Check length in PKEY_VERIFYPROTK ioctl. 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 <0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <693bf91d4db134f9b1c2840c8e287eee3d993bac || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <7e7e03848c918aa0acad5ffd75d929e3afec1554 || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 | 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7, 693bf91d4db134f9b1c2840c8e287eee3d993bac, 7e7e03848c918aa0acad5ffd75d929e3afec1554, b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 |
| 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_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64559 records a Unknown severity vulnerability in s390/pkey: Check length in PKEY_VERIFYPROTK ioctl. 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 <0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <693bf91d4db134f9b1c2840c8e287eee3d993bac || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <7e7e03848c918aa0acad5ffd75d929e3afec1554 || >=8fcc231ce3bea12b78bb94b280cdc03cff342435 <b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 | 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7, 693bf91d4db134f9b1c2840c8e287eee3d993bac, 7e7e03848c918aa0acad5ffd75d929e3afec1554, b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 |
| 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_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.
Quoted source text, attributed separately from HOL analysis.