CVE-2012-4516: librdmacm 1.0.16, when ibacm.port is not specified, connects to port 6125, which allows remote attackers to sp

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MEDIUM 5.8DOWNGRADE

CVE-2012-4516 is a medium-severity flaw (CVSS 5.8) affecting librdmacm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

librdmacm 1.0.16, when ibacm.port is not specified, connects to port 6125, which allows remote attackers to specify the address resolution information for the application via a malicious ib_acm service.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.8 (Medium)
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Published	2012-10-22
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: openfabrics

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-10-22 23:55 UTCPublished CVE record published
2026-06-16 23:45 UTCUpdated Record last modified

openfabrics librdmacm DOWNGRADE

Affected: 1.0.16

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.16

1. Check installed version

apt-cache policy librdmacm || rpm -q librdmacm || librdmacm --version

2. No fixed release: DOWNGRADE to a release before 1.0.16 (Debian / Ubuntu)

apt-cache madison librdmacm sudo apt install librdmacm=<VERSION_BEFORE_1.0.16> sudo apt-mark hold librdmacm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list librdmacm sudo dnf downgrade librdmacm-<VERSION_BEFORE_1.0.16> sudo dnf versionlock add librdmacm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-4516?

librdmacm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-4516 being exploited?

CVE-2012-4516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-4516 affect?

CVE-2012-4516 affects librdmacm. Severity is medium (CVSS 5.8). librdmacm 1.0.16, when ibacm.port is not specified, connects to port 6125, which allows remote attackers to specify the address resolution information for the application via a malicious ib_acm service.

How urgent is CVE-2012-4516?

Priority 41/100. No elevated risk signals yet.

References

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