CVE-2025-39793
- Source
- https://cve.org/CVERecord?id=CVE-2025-39793
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39793.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-39793
- Downstream
- Published
- 2025-09-12T15:59:30.388Z
- Modified
- 2026-08-12T03:51:35.199125283Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- io_uring/memmap: cast nr_pages to size_t before shifting
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
iouring/memmap: cast nrpages to size_t before shifting
If the allocated size exceeds UINTMAX, then it's necessary to cast the mr->nrpages value to sizet 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 lockedvm 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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39793.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/33503c083fda048c77903460ac0429e1e2c0e341
- https://git.kernel.org/stable/c/a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a
- https://git.kernel.org/stable/c/c6a2706e08b8a1b2d3740161c0977d38e596c1ee
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39793.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-39793
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git