CVE-2024-52877: An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.3

This month

HIGH 7.5REMOTEUPGRADE

CVE-2024-52877 is a high-severity flaw (CVSS 7.5) affecting insydeh2o. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.38.50, kernel 5.4 before version 05.46.50, kernel 5.5 before version 05.54.50, kernel 5.6 before version 05.61.50, and kernel 5.7 before version 05.70.50. In VariableRuntimeDxe driver, callback function SmmCreateVariableLockList () calls CreateVariableLockListInSmm (). In CreateVariableLockListInSmm (), it uses StrSize () to get variable n

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-126
Published	2025-05-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: insyde

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

Am I affected?

Timeline

2025-05-15 16:15 UTCPublished CVE record published
2026-06-17 08:07 UTCUpdated Record last modified

insyde insydeh2o UPGRADE

Affected: >= 5.2 and < 5.2.05.29.50 · >= 5.3 and < 5.3.05.38.50 · >= 5.4 and < 5.4.05.46.50 · >= 5.5 and < 5.5.05.54.50 · >= 5.6 and < 5.6.05.61.50 · >= 5.7 and < 5.7.05.70.50

Fixed in: 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50, 5.6.05.61.50, 5.7.05.70.50

Safe to downgrade to: a release before 5.2

1. Check installed version

apt-cache policy insydeh2o || rpm -q insydeh2o || insydeh2o --version

2. UPGRADE to 5.2.05.29.50 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade insydeh2o

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade insydeh2o

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 5.2 (Debian / Ubuntu)

apt-cache madison insydeh2o sudo apt install insydeh2o=<VERSION_BEFORE_5.2> sudo apt-mark hold insydeh2o

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

dnf --showduplicates list insydeh2o sudo dnf downgrade insydeh2o-<VERSION_BEFORE_5.2> sudo dnf versionlock add insydeh2o

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-2024-52877?

insydeh2o: upgrade to 5.2.05.29.50, 5.3.05.38.50, 5.4.05.46.50, 5.5.05.54.50, 5.6.05.61.50, 5.7.05.70.50. Exact commands for each OS are on this page.

Is CVE-2024-52877 being exploited?

CVE-2024-52877 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-2024-52877 affect?

CVE-2024-52877 affects insydeh2o. Severity is high (CVSS 7.5). An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.38.50, kernel 5.4 before version 05.46.50, kernel 5.5 before version 05.54.50, kernel 5.6 before version 05.61.50, and kernel 5.7 b

How urgent is CVE-2024-52877?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-55567 HIGH 7.5 UPGRADE Improper input validation was discovered in UsbCoreDxe in Insyde InsydeH2O kernel 5.4 before 05.47.01, 5.5 bef
CVE-2024-52879 HIGH 7.5 UPGRADE An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.3
CVE-2024-52878 HIGH 7.5 UPGRADE An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.3

References

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