CVE-2026-68120 — rtase: Workaround for TX hang caused by hardware packet parsing

Affected: Linux

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

rtase: Workaround for TX hang caused by hardware packet parsing

The hardware performs packet parsing before packet transmission. Parsing incomplete IPv4, IPv6, TCP, or UDP headers may trigger a TX hang because the hardware parser expects additional protocol header data that is not present in the packet.

The hardware performs additional PTP parsing on UDP packets identified by destination ports 319/320 at the expected UDP destination port offset.

If such a packet has transport data smaller than RTASE_MIN_PAD_LEN, the hardware parser expects additional packet data and may trigger a TX hang.

To avoid these hardware issues, the driver applies the following workarounds.

Drop malformed packets that may trigger this hardware issue before transmission.

For IPv4 non-initial fragments, the hardware does not check the fragment offset before parsing the expected transport header location. As a result, these packets are still subject to transport header parsing even though they do not contain a transport header. If the transport data is shorter than the minimum transport header required by the hardware parser, pad the transport data to the minimum transport header length required by the hardware parser. Packets that also match the hardware PTP parsing conditions continue to follow the corresponding workaround.

For IPv6 fragmented packets, neither of the above hardware issues occurs because the hardware only conti…

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CVE-2026-68120 — rtase: Workaround for TX hang caused by hardware packet parsing