What’s Vulnerable › Vulnerabilities

CVE-2025-68317: io_uring/zctx: check chained notif contexts

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-16 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/zctx: check chained notif contexts Send zc only links ubuf_info for requests coming from the same context. There are some ambiguous syz reports, so let's check the assumption on notification completion.

Affected products

• Linux kernel: 6.10 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/aaafd17d3f4be2c15539359a5b4bfa00237f687f
• https://git.kernel.org/stable/c/ab3ea6eac5f45669b091309f592c4ea324003053
• https://git.kernel.org/stable/c/d664a3ce3a604231a0b144c152a3755d03b18b60

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