CVE-2019-13351: posix/JackSocket.cpp in libjack in JACK2 1.9.1 through 1.9.12 (as distributed with alsa-plugins 1.1.7 and late

Q: How do I fix CVE-2019-13351?

jack2: upgrade to newer than 1.9.12; alsa: upgrade to newer than 1.1.7. Exact commands for each OS are on this page.

Q: Is CVE-2019-13351 being exploited?

CVE-2019-13351 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-13351 affect?

CVE-2019-13351 affects jack2, alsa. Severity is high (CVSS 8.1). posix/JackSocket.cpp in libjack in JACK2 1.9.1 through 1.9.12 (as distributed with alsa-plugins 1.1.7 and later) has a "double file descriptor close" issue during a failed connection attempt when jackd2 is not running. Exploitation success

Q: How urgent is CVE-2019-13351?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.1REMOTEUPGRADEUPGRADE

CVE-2019-13351 is a high-severity flaw (CVSS 8.1) affecting jack2, alsa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

posix/JackSocket.cpp in libjack in JACK2 1.9.1 through 1.9.12 (as distributed with alsa-plugins 1.1.7 and later) has a "double file descriptor close" issue during a failed connection attempt when jackd2 is not running. Exploitation success depends on multithreaded timing of that double close, which can result in unintended information disclosure, crashes, or file corruption due to having the wrong file associated with the file descriptor.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2019-07-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: alsa-project · jackaudio

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-05 20:15 UTCPublished CVE record published
2026-06-17 02:16 UTCUpdated Record last modified

jackaudio jack2 UPGRADE

Affected: >= 1.9.1 and <= 1.9.12

Fixed in: newer than 1.9.12

Safe to downgrade to: a release before 1.9.1

1. Check installed version

apt-cache policy jack2 || rpm -q jack2 || jack2 --version

2. UPGRADE to newer than 1.9.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jack2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jack2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.9.1 (Debian / Ubuntu)

apt-cache madison jack2 sudo apt install jack2=<VERSION_BEFORE_1.9.1> sudo apt-mark hold jack2

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jack2 sudo dnf downgrade jack2-<VERSION_BEFORE_1.9.1> sudo dnf versionlock add jack2

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.

alsa-project alsa UPGRADE

Affected: <= 1.1.7

Fixed in: newer than 1.1.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade alsa

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade alsa

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2019-13351?

jack2: upgrade to newer than 1.9.12; alsa: upgrade to newer than 1.1.7. Exact commands for each OS are on this page.

Is CVE-2019-13351 being exploited?

CVE-2019-13351 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-2019-13351 affect?

CVE-2019-13351 affects jack2, alsa. Severity is high (CVSS 8.1). posix/JackSocket.cpp in libjack in JACK2 1.9.1 through 1.9.12 (as distributed with alsa-plugins 1.1.7 and later) has a "double file descriptor close" issue during a failed connection attempt when jackd2 is not running. Exploitation success

How urgent is CVE-2019-13351?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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