Answer in brief
CVE-2025-39793 records a Unknown severity vulnerability in io_uring/memmap: cast nr_pages to size_t before shifting. 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 | >=087f997870a948820ec366701d178f402c6a23a3 <c6a2706e08b8a1b2d3740161c0977d38e596c1ee || >=087f997870a948820ec366701d178f402c6a23a3 <a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a || >=087f997870a948820ec366701d178f402c6a23a3 <33503c083fda048c77903460ac0429e1e2c0e341 | c6a2706e08b8a1b2d3740161c0977d38e596c1ee, a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a, 33503c083fda048c77903460ac0429e1e2c0e341 |
| Linux/Linuxgeneric | 6.14 | Not reported |
Published upstream
Sep 12, 2025
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: io_uring/memmap: cast nr_pages to size_t before shifting If the allocated size exceeds UINT_MAX, then it's necessary to cast the mr->nr_pages value to size_t to prevent it from overflowing. In practice this isn't much of a concern as the required memory size will have been validated upfront, and accounted to the user. And > 4GB sizes will be necessary to make the lack of a cast a problem, which greatly exceeds normal user locked_vm settings that are generally in the kb to mb range. However, if root is used, then accounting isn't done, and then it's possible to hit this issue.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-39793 records a Unknown severity vulnerability in io_uring/memmap: cast nr_pages to size_t before shifting. 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 | >=087f997870a948820ec366701d178f402c6a23a3 <c6a2706e08b8a1b2d3740161c0977d38e596c1ee || >=087f997870a948820ec366701d178f402c6a23a3 <a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a || >=087f997870a948820ec366701d178f402c6a23a3 <33503c083fda048c77903460ac0429e1e2c0e341 | c6a2706e08b8a1b2d3740161c0977d38e596c1ee, a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a, 33503c083fda048c77903460ac0429e1e2c0e341 |
| Linux/Linuxgeneric | 6.14 | Not reported |
Published upstream
Sep 12, 2025
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: io_uring/memmap: cast nr_pages to size_t before shifting If the allocated size exceeds UINT_MAX, then it's necessary to cast the mr->nr_pages value to size_t to prevent it from overflowing. In practice this isn't much of a concern as the required memory size will have been validated upfront, and accounted to the user. And > 4GB sizes will be necessary to make the lack of a cast a problem, which greatly exceeds normal user locked_vm settings that are generally in the kb to mb range. However, if root is used, then accounting isn't done, and then it's possible to hit this issue.
Quoted source text, attributed separately from HOL analysis.