In the Linux kernel, the following vulnerability has been resolved: io_uring: fix regbuf vector size truncation There is a report of io_estimate_bvec_size() truncating…

Code

The project this record applies to. Exploit listings stay in References.

• Repository · git.kernel.org
• Repository · git.kernel.org

Timeline

Detection, updates, and resolution for this record.

1. Dec 8, 2025 · NIST NVD

   Detected

   In the Linux kernel, the following vulnerability has been resolved: io_uring: fix regbuf vector size truncation There is a report of io_estimate_bvec_size() truncating the calculated number of segments that leads to corruption issues. Check it doesn't overflow "int"s used later. Rough but simple, can be improved on top.

2. Oct 14, 2026 · NIST NVD

   Updated

   In the Linux kernel, the following vulnerability has been resolved: io_uring: fix regbuf vector size truncation There is a report of io_estimate_bvec_size() truncating the calculated number of segments that leads to corruption issues. Check it doesn't overflow "int"s used later. Rough but simple, can be improved on top.

Sources

• CVE.orgVulnerability recordCVE-2025-40291

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2025-40291

  30-day exploitation probability 0.1%

  first.org
• NIST NVDVulnerability recordCVE-2025-40291

  In the Linux kernel, the following vulnerability has been resolved: io_uring: fix regbuf vector size truncation There is a report of io_estimate_bvec_size() truncating the calculated number of segments that leads to corruption issues. Check it doesn't overflow "int"s used later

  nvd.nist.gov

References

• Reference · git.kernel.org
• Reference · git.kernel.org