rtase: Workaround for TX hang caused by hardware packet parsing

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Summary

CVECVE-2026-68120
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:19:57 UTC
Updated2026-08-13 23:17:17 UTC
DescriptionIn 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 continues packet parsing when the IPv6 Base Header Next Header field directly indicates UDP. Packets carrying a Fragment Header do not continue through the subsequent packet parsing stages. For packets identified for hardware PTP parsing, pad the transport data so it reaches RTASE_MIN_PAD_LEN before transmission.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004460000 probability, percentile 0.369910000 (date 2026-08-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 fe3a7320711eec6537e4890892f7ab9776d8618f git Not specified
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 4a4f3aa6af205bee539b5670afa2cd4e4953750e git Not specified
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 0f54f5048615e4e2802697855ea6374613548301 git Not specified
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 1c50efa1faf3a1a96e100b07ec7a2f3164d90bee git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fe3a7320711eec6537e4890892f7ab9776d8618f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a4f3aa6af205bee539b5670afa2cd4e4953750e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f54f5048615e4e2802697855ea6374613548301 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c50efa1faf3a1a96e100b07ec7a2f3164d90bee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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