CVE-2025-40291
High
Description
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux
PublishedDec 8, 2025
First seenDec 8, 2025
How to fix
Update
- Linux Linux826ce37a842633efe1bb763e4b13045d74060d72, 146eb58629f45f8297e83d69e64d4eea4b28d972 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 9ef4cbbcb4ac3786a1a4164507511b76b2a572c5 ≤ v < 826ce37a842633efe1bb763e4b13045d74060d72, 9ef4cbbcb4ac3786a1a4164507511b76b2a572c5 ≤ v < 146eb58629f45f8297e83d69e64d4eea4b28d972, 6.15 | 826ce37a842633efe1bb763e4b13045d74060d72, 146eb58629f45f8297e83d69e64d4eea4b28d972 |
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