Vulnerability record · CVE-2025-39963 · published 9 October 2025

CVE-2025-39963: Linux kernel memory leak vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.15% · top 96.4% CWE-401 · Memory leak

7.8CVSS 3.1 base score

0.15%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References

30 Jul 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Linux Kernel Linux

References

Link	Tags
https://git.kernel.org/stable/c/2c139a47eff8de24e3350dadb4c9d5e3426db826	Patch
https://git.kernel.org/stable/c/50a98ce1ea694f1ff8e87bc2f8f84096d1736f6a	Patch
https://git.kernel.org/stable/c/a89c34babc2e5834aa0905278f26f4dbe4b26b76	Patch

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-39963), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.