CVE-2025-40046
High
Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix overshooting recv limit It's reported that sometimes a zcrx request can receive more than was requested. It's caused by io_zcrx_recv_skb() adjusting desc->count for all received buffers including frag lists, but then doing recursive calls to process frag list skbs, which leads to desc->count double accounting and underflow.
SeverityHigh
CVSS8.6
Exploit probability—
Product
Linux
PublishedOct 28, 2025
First seenOct 28, 2025
How to fix
Update
- Linux Linux8bcc9eaf1b19f1a7029cba19f6bd4122b40f6c4f, 09cfd3c52ea76f43b3cb15e570aeddf633d65e80 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6699ec9a23f85f1764183430209c741847c45f12 ≤ v < 8bcc9eaf1b19f1a7029cba19f6bd4122b40f6c4f, 6699ec9a23f85f1764183430209c741847c45f12 ≤ v < 09cfd3c52ea76f43b3cb15e570aeddf633d65e80, 6.15 | 8bcc9eaf1b19f1a7029cba19f6bd4122b40f6c4f, 09cfd3c52ea76f43b3cb15e570aeddf633d65e80 |
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