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CVE-2026-63857

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit() The transmit loop in airoha_dev_xmit() reads fragm…

Published Jul 19, 2026EPSS 0.65%

Overview

CVE-2026-63857 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()

The transmit loop in airoha_dev_xmit() reads fragment address and length

during its final iteration, when the loop index equals

skb_shinfo(skb)->nr_frags, at which point the fragment data is

uninitialized. While these values are never consumed, the read itself is

unsafe and may trigger a page fault. Fix this by avoiding the fragment

read on the last iteration.

Additionally, move the skb pointer from the first to the last used packet

descriptor, so that airoha_qdma_tx_napi_poll() defers freeing the skb

until the final descriptor is processed.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/bde34e84edc8b5571fbde7e941e175a4293ee1ebRefgit.kernel.org/stable/c/d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3Refgit.kernel.org/stable/c/f670fa4b19ceddc6d215dda4997888ccba9bbc61

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63857?

CVE-2026-63857 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-63857?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63857?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63857?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63857 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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