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CVE-2025-39963

io_uring: fix incorrect io_kiocb reference in io_link_skb

HIGH
7.8
CVSS Score
Published: October 9, 2025 at 12:13 PM UTC
Updated: October 19, 2026 at 09:10 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.10 ≤ v < 6.12.496.13 ≤ v < 6.16.96.176.17 rc16.17 rc26.17 rc36.17 rc46.17 rc56.17 rc66fe4220912d19152a26ce19713ab232f4263018d
Vendor states this is fixed in 2c139a47eff8de24e3350dadb4c9d5e3426db826 (fixed)
Vendor states this is fixed in 50a98ce1ea694f1ff8e87bc2f8f84096d1736f6a (fixed)
Vendor states this is fixed in a89c34babc2e5834aa0905278f26f4dbe4b26b76 (fixed)
Vendor states this is fixed in 6.10 (unaffected)
Vendor states this is fixed in 6.12.49 (unaffected)
Vendor states this is fixed in 6.16.9 (unaffected)
Vendor states this is fixed in 6.17 (unaffected)

References (3)

Patch
Source: cverecord
https://git.kernel.org/stable/c/a89c34babc2e5834aa0905278f26f4dbe4b26b76
Patch
Source: cverecord
https://git.kernel.org/stable/c/50a98ce1ea694f1ff8e87bc2f8f84096d1736f6a
Patch
Source: cverecord
https://git.kernel.org/stable/c/2c139a47eff8de24e3350dadb4c9d5e3426db826

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-401

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