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CVE-2026-74678

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup() When the interface has NETIF_F_SG enabled and skb_linearize() fails…

Published Aug 22, 2026EPSS 0.48%

Overview

CVE-2026-74678 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup()

When the interface has NETIF_F_SG enabled and skb_linearize() fails in

ax88179_tx_fixup(), the function returns NULL without freeing the skb.

usbnet_start_xmit() treats a NULL return from tx_fixup() as a drop

(info->flags does not set FLAG_MULTI_PACKET for this driver), jumping

to the "drop" label where it does `if (skb) dev_kfree_skb_any(skb)`.

Because tx_fixup() returned NULL, the local skb variable in

usbnet_start_xmit() is NULL, so the original skb is never freed — a

memory leak on every TX frame whose linearization fails (i.e. under

memory pressure).

Free the skb before returning, matching the error handling already used

for the pskb_expand_head() failure path in the same function.

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/1c63303659a2264bd55d9813df74cb4caeed5922Refgit.kernel.org/stable/c/1f428e30947395d9b9aacee03e25a4e6cfcad7a4Refgit.kernel.org/stable/c/2be5091fa693b9119ad25a8bb8c149d236a23adeRefgit.kernel.org/stable/c/4039cd807a5a46dc5f7618fffae926b8ad8455ebRefgit.kernel.org/stable/c/58733b1dd46bb231d9d279c132a20ee46da1b664Refgit.kernel.org/stable/c/83a765cbd7b4d11b0b9fa1bb9d941ae911a2159b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74678?

CVE-2026-74678 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-74678?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-74678?

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-2026-74678?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74678 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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