High 7.8Published Dec 16, 2025

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

Updated under an hour ago (Oct 27, 2026, 1:23 PM ET)

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It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 6fe4220912d19152a26ce19713ab232f4263018d before aaafd17d3f4be2c15539359a5b4bfa00237f687f; from 6fe4220912d19152a26ce19713ab232f4263018d before d664a3ce3a604231a0b144c152a3755d03b18b60; from 6fe4220912d19152a26ce19713ab232f4263018d before ab3ea6eac5f45669b091309f592c4ea324003053	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.