High 7.8Published Oct 9, 2025

CVE-2025-39963io_uring: fix incorrect io_kiocb reference in io_link_skb

Updated under an hour ago (2026-10-19 08:50 UTC)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix incorrect io_kiocb reference in io_link_skb In io_link_skb function, there is a bug where prev_notif is incorrectly assigned using 'nd' instead of 'prev_nd'. This causes the context validation check to compare the current notification with itself instead of comparing it with the previous notification. Fix by using the correct prev_nd parameter when obtaining prev_notif.

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: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 6fe4220912d19152a26ce19713ab232f4263018d before a89c34babc2e5834aa0905278f26f4dbe4b26b76; from 6fe4220912d19152a26ce19713ab232f4263018d before 50a98ce1ea694f1ff8e87bc2f8f84096d1736f6a; 6fe4220912d19152a26ce19713ab232f4263018d builds before 2c139a47eff8de24e3350dadb4c9d5e3426db826	CNA record
linux linux_kernel linux:linux_kernel	from 6.10 before 6.12.49; from 6.13 before 6.16.9; 6.17; 6.17; 6.17; 6.17; 6.17; 6.17	NVD

References

https://git.kernel.org/stable/c/a89c34babc2e5834aa0905278f26f4dbe4b26b76patch
https://git.kernel.org/stable/c/50a98ce1ea694f1ff8e87bc2f8f84096d1736f6apatch
https://git.kernel.org/stable/c/2c139a47eff8de24e3350dadb4c9d5e3426db826patch

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.