CVE-2026-68411: In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: clamp virtio RX length before skb_put hwsim_virtio_rx_work...

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: clamp virtio RX length before skb_put hwsim_virtio_rx_work() passes the virtqueue used-ring length reported by the device straight to skb_put() on a fixed-size receive skb. A backend reporting a length larger than the skb tailroom drives skb_put() past the buffer end and hits skb_over_panic() -- a host-triggerable guest panic (denial of service). Clamp the length to the skb's available room before skb_put(). A conforming device never reports more than the posted buffer size, so valid frames are unaffected; a truncated over-report then fails the length/header checks in hwsim_virtio_handle_cmd() and is dropped, so truncating rather than dropping here cannot be turned into a parsing problem.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 5d44fe7c9808c56e136e59147bd932f5491520f1, < 82c5a30a66e2a7337d99476c67d6fc1a99c4250e; >= 5d44fe7c9808c56e136e59147bd932f5491520f1, < fade308845c89f784da8a6780c1e77258488f1b6; >= 5d44fe7c9808c56e136e59147bd932f5491520f1, < 6dc76371a9a360c29de00df5b11563102d9d675a; >= 5d44fe7c9808c56e136e59147bd932f5491520f1, < 99dc05c75acc3c8cde8d89c5371f4b569de5ac62; >= 5d44fe7c9808c56e136e59147bd932f5491520f1, < 10a2b430f8f06ae14b9590b6f6faa6b588ef0654
Linux	Linux	5.7

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 10, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-68411?

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: clamp virtio RX length before skb_put hwsim_virtio_rx_work() passes the virtqueue used-ring length reported by the device straight to skb_put() on a fixed-size receive skb. A backend reporting a length larger than the skb tailroom drives skb_put() past the buffer end and hits skb_over_panic() -- a host-triggerable guest panic (denial of service). Clamp the length to the skb's available room before skb_put(). A conforming device never reports more than the posted buffer size, so valid frames are unaffected; a truncated over-report then fails the length/header checks in hwsim_virtio_handle_cmd() and is dropped, so truncating rather than dropping here cannot be turned into a parsing problem.

How severe is CVE-2026-68411?

Severity scoring for CVE-2026-68411 is pending analysis.

How do I fix CVE-2026-68411?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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