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Review reviewHigh

CVE-2025-39963

Linux 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.

CVSS
7.8
EPSS
0.14%
3.88% percentile
CISA KEV
Not listed
Published
2025.10.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 6fe4220912d19152a26ce19713ab232f4263018d < a89c34babc2e5834aa0905278f26f4dbe4b26b76, >= 6fe4220912d19152a26ce19713ab232f4263018d < 50a98ce1ea694f1ff8e87bc2f8f84096d1736f6a, >= 6fe4220912d19152a26ce19713ab232f4263018d < 2c139a47eff8de24e3350dadb4c9d5e3426db826, >= 6.10, >= 6.10 < 6.12.49, >= 6.13 < 6.16.9, 6.17
Fixed versions
6.12.49, 6.16.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-401