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CVE-2025-62863: Ampere AmpereOne AC03 devices before 3.5.9.3, AmpereOne AC04 devices before 4.4.5.2, and AmpereOne M devices b

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CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2025-62863 is a critical-severity flaw (CVSS 9.8) affecting ampereone a192-32m firmware, ampereone a192-26m firmware, ampereone a160-28m firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ampere AmpereOne AC03 devices before 3.5.9.3, AmpereOne AC04 devices before 4.4.5.2, and AmpereOne M devices before 5.4.5.1 allow an incorrectly formed SMC call to UEFI-MM PCIe driver that could result in an out-of-bounds write within PCIe driver’s S-EL0 address space.

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 70%)
CISA exploited listNo
WeaknessCWE-787
Published2025-12-16
Last modified2026-10-13
Publisher (CNA): MITRE · Vendor: amperecomputing

Share: LinkedIn · X · Reddit

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

amperecomputing ampereone a192-32m firmware UPGRADE
Affected: < 5.4.5.1
Fixed in: 5.4.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
amperecomputing ampereone a192-26m firmware UPGRADE
Affected: < 5.4.5.1
Fixed in: 5.4.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
amperecomputing ampereone a160-28m firmware UPGRADE
Affected: < 5.4.5.1
Fixed in: 5.4.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
amperecomputing ampereone a144-33m firmware UPGRADE
Affected: < 5.4.5.1
Fixed in: 5.4.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
amperecomputing ampereone a144-26m firmware UPGRADE
Affected: < 5.4.5.1
Fixed in: 5.4.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
amperecomputing ampereone a96-36m firmware UPGRADE
Affected: < 5.4.5.1
Fixed in: 5.4.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
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-2025-62863?

ampereone a192-32m firmware: upgrade to 5.4.5.1; ampereone a192-26m firmware: upgrade to 5.4.5.1; ampereone a160-28m firmware: upgrade to 5.4.5.1. Exact commands for each OS are on this page.

Is CVE-2025-62863 being exploited?

CVE-2025-62863 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-2025-62863 affect?

CVE-2025-62863 affects ampereone a192-32m firmware, ampereone a192-26m firmware, ampereone a160-28m firmware. Severity is critical (CVSS 9.8). Ampere AmpereOne AC03 devices before 3.5.9.3, AmpereOne AC04 devices before 4.4.5.2, and AmpereOne M devices before 5.4.5.1 allow an incorrectly formed SMC call to UEFI-MM PCIe driver that could result in an out-of-bounds write within PCIe

How urgent is CVE-2025-62863?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

References

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