CVE-2019-15540: filters/filter-cso/filter-stream.c in the CSO filter in libMirage 3.2.2 in CDemu does not validate the part si

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HIGH 7.8DOWNGRADE

CVE-2019-15540 is a high-severity flaw (CVSS 7.8) affecting libmirage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

filters/filter-cso/filter-stream.c in the CSO filter in libMirage 3.2.2 in CDemu does not validate the part size, triggering a heap-based buffer overflow that can lead to root access by a local Linux user.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-08-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cdemu

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

Am I affected?

Timeline

2019-08-25 17:15 UTCPublished CVE record published
2026-06-17 02:20 UTCUpdated Record last modified

cdemu libmirage DOWNGRADE

Affected: 3.2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2.2 (Debian / Ubuntu)

apt-cache madison libmirage sudo apt install libmirage=<VERSION_BEFORE_3.2.2> sudo apt-mark hold libmirage

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

dnf --showduplicates list libmirage sudo dnf downgrade libmirage-<VERSION_BEFORE_3.2.2> sudo dnf versionlock add libmirage

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-2019-15540?

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

Is CVE-2019-15540 being exploited?

CVE-2019-15540 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-2019-15540 affect?

CVE-2019-15540 affects libmirage. Severity is high (CVSS 7.8). filters/filter-cso/filter-stream.c in the CSO filter in libMirage 3.2.2 in CDemu does not validate the part size, triggering a heap-based buffer overflow that can lead to root access by a local Linux user.

How urgent is CVE-2019-15540?

Priority 44/100. High severity; Public exploit reference

Related CVEs

CVE-2019-15757 MEDIUM 6.5 DOWNGRADE libMirage 3.2.2 in CDemu has a NULL pointer dereference in the NRG parser in parser.c.

References

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