What’s Vulnerable › Vulnerabilities

CVE-2026-63857: net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-21

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.

Affected products

• Linux kernel: 6.11 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/bde34e84edc8b5571fbde7e941e175a4293ee1eb
• https://git.kernel.org/stable/c/d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3
• https://git.kernel.org/stable/c/dba5f4959653e4c212beb746594952e8645d1115
• https://git.kernel.org/stable/c/f670fa4b19ceddc6d215dda4997888ccba9bbc61

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