n 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.
Configuration 1 (hide)
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25 Nov 2025, 14:43
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
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| References | () https://git.kernel.org/stable/c/33503c083fda048c77903460ac0429e1e2c0e341 - Patch | |
| References | () https://git.kernel.org/stable/c/a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a - Patch | |
| References | () https://git.kernel.org/stable/c/c6a2706e08b8a1b2d3740161c0977d38e596c1ee - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | NVD-CWE-noinfo | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
15 Sep 2025, 15:21
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2025-09-12 16:15
Updated : 2025-11-25 14:43
NVD link : CVE-2025-39793
Mitre link : CVE-2025-39793
CVE.ORG link : CVE-2025-39793
JSON object : View