01 Record

CVE-2025-39816

io_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths

MediumPUBLISHEDCNA: Linux

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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02 Description

io_uring/kbuf: always use READ_ONCE() to read ring provided buffer lengths

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.14% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 4.3% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-09-16 13:00Z11 MO AGO

Last updated

2026-05-11 21:36Z3 MO AGO

Reserved

2025-04-16

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase

Data version

5.2

Document digest

b8aeb3610ee414cebc2c0167a1e19fa30eb3837a1d4dd4e6e6f8640151a62801

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxae98dbf43d755b4e111fcd086e53939bef3e9a1a to < 695673eb5711ee5eb1769481cf1503714716a7d1, ae98dbf43d755b4e111fcd086e53939bef3e9a1a to < 91f262ea2a76a02d9e37dba6637cfe6feebb20a8, ae98dbf43d755b4e111fcd086e53939bef3e9a1a to < 390a61d284e1ced088d43928dfcf6f86fffdd780, ae98dbf43d755b4e111fcd086e53939bef3e9a1a to < 98b6fa62c84f2e129161e976a5b9b3cb4ccd117b, 6.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/695673eb5711ee5eb1769481cf1503714716a7d1
git.kernel.orghttps://git.kernel.org/stable/c/91f262ea2a76a02d9e37dba6637cfe6feebb20a8
git.kernel.orghttps://git.kernel.org/stable/c/390a61d284e1ced088d43928dfcf6f86fffdd780
git.kernel.orghttps://git.kernel.org/stable/c/98b6fa62c84f2e129161e976a5b9b3cb4ccd117b

01 Record index

CVE-2025-39816

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2025-39816

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References