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Vulnerability record · CVE-2021-3923 · published 27 March 2023

CVE-2021-3923: Linux kernel information exposure vulnerability

Linux · Linux Kernel

A flaw was found in the Linux kernel's implementation of RDMA over infiniband. An attacker with a privileged local account can leak kernel stack information when issuing commands to the /dev/infiniband/rdma_cm device node. While this access is unlikely to leak sensitive user information, it can be further used to defeat existing kernel protection mechanisms.

2.3 CVSS 3.1 Low EPSS 0.20% · top 91.3% CWE-200 · Information exposure
2.3CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the Linux kernel's implementation of RDMA over infiniband. An attacker with a privileged local account can leak kernel stack information when issuing commands to the /dev/infiniband/rdma_cm device node. While this access is unlikely to leak sensitive user information, it can be further used to defeat existing kernel protection mechanisms.

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

Affected products

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

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=2019643 Issue TrackingPatchThird Party Advisory
https://lore.kernel.org/all/20220204100036.GA12348%40kili/
https://bugzilla.redhat.com/show_bug.cgi?id=2019643 Issue TrackingPatchThird Party Advisory
https://lore.kernel.org/all/20220204100036.GA12348%40kili/

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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-2021-3923), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.