CVE-2026-42799: Out-of-bounds read vulnerability in ASR Kestrel (nr_fw modules) allows Overflow Buffers. This vulnerability

Q: How do I fix CVE-2026-42799?

asr1803 firmware: upgrade to 1.216.002. Exact commands for each OS are on this page.

Q: Is CVE-2026-42799 being exploited?

CVE-2026-42799 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-2026-42799 affect?

CVE-2026-42799 affects asr1803 firmware. Severity is high (CVSS 7.4). Out-of-bounds read vulnerability in ASR Kestrel (nr_fw modules) allows Overflow Buffers. This vulnerability is associated with program files Code/Nr/nr_fw/RA/src/NrPwrCtrl.C. This issue affects Kestrel: before 2026/02/10.

Routine

HIGH 7.4UPGRADE

CVE-2026-42799 is a high-severity flaw (CVSS 7.4) affecting asr1803 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Out-of-bounds read vulnerability in ASR Kestrel (nr_fw modules) allows Overflow Buffers. This vulnerability is associated with program files Code/Nr/nr_fw/RA/src/NrPwrCtrl.C. This issue affects Kestrel: before 2026/02/10.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-04-30
Last modified	2026-10-26

Publisher (CNA): ASR Microelectronics Co., Ltd. · Vendor: asrmicro

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-30 09:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

asrmicro asr1803 firmware UPGRADE

Affected: < 1.216.002

Fixed in: 1.216.002

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-2026-42799?

asr1803 firmware: upgrade to 1.216.002. Exact commands for each OS are on this page.

Is CVE-2026-42799 being exploited?

CVE-2026-42799 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-2026-42799 affect?

CVE-2026-42799 affects asr1803 firmware. Severity is high (CVSS 7.4). Out-of-bounds read vulnerability in ASR Kestrel (nr_fw modules) allows Overflow Buffers. This vulnerability is associated with program files Code/Nr/nr_fw/RA/src/NrPwrCtrl.C. This issue affects Kestrel: before 2026/02/10.

How urgent is CVE-2026-42799?

Priority 31/100. High severity

References

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