CVE-2025-40046

HighCVSS 8.6/10Last modified Oct 19, 2026

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.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected software

VendorProductVersions
LinuxLinux>= 6699ec9a23f85f1764183430209c741847c45f12, < 8bcc9eaf1b19f1a7029cba19f6bd4122b40f6c4f; >= 6699ec9a23f85f1764183430209c741847c45f12, < 09cfd3c52ea76f43b3cb15e570aeddf633d65e80
LinuxLinux6.15

References

Timeline

Published
Oct 28, 2025
Last modified
Oct 19, 2026
NVD status
Deferred

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CVE-2025-40046: High severity, CVSS 8.6 | Vulnix