CVE-2019-16921

Name: CVE-2019-16921
Creator: NVD / NIST
Published: 2019-09-27T13:15:10.553+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.99%

Last modified Jun 17, 2026

CVE-2019-16921 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In the Linux kernel before 4.17, hns_roce_alloc_ucontext in drivers/infiniband/hw/hns/hns_roce_main.c does not initialize the resp data structure, which might allow attackers to obtain sensitive information from kernel stack memory, aka CID-df7e40425813.. EPSS estimates a 1.99% chance of exploitation in the next 30 days.

Description

In the Linux kernel before 4.17, hns_roce_alloc_ucontext in drivers/infiniband/hw/hns/hns_roce_main.c does not initialize the resp data structure, which might allow attackers to obtain sensitive information from kernel stack memory, aka CID-df7e40425813.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.99%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-665

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 4.17

References

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=df7e40425813c50cd252e6f5e348a81ef1acae56Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/df7e40425813c50cd252e6f5e348a81ef1acae56Patch, Third Party Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=df7e40425813c50cd252e6f5e348a81ef1acae56Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/df7e40425813c50cd252e6f5e348a81ef1acae56Patch, Third Party Advisory

Timeline

Published: Sep 27, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16921?

How severe is CVE-2019-16921?

CVE-2019-16921 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16921?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-16921?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST