net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback

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Summary

CVECVE-2026-43057
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:52 UTC
Updated2026-05-03 07:16:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback NETIF_F_IPV6_CSUM only advertises support for checksum offload of packets without IPv6 extension headers. Packets with extension headers must fall back onto software checksumming. Since TSO depends on checksum offload, those must revert to GSO. The below commit introduces that fallback. It always checks network header length. For tunneled packets, the inner header length must be checked instead. Extend the check accordingly. A special case is tunneled packets without inner IP protocol. Such as RFC 6951 SCTP in UDP. Those are not standard IPv6 followed by transport header either, so also must revert to the software GSO path.

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: 0.000240000 probability, percentile 0.068220000 (date 2026-05-02)

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 a0478d7e888028f85fa7785ea838ce0ca09398e2 2094a7cf91b71367b649f991aacc7b579f793d0b git Not specified
CNA Linux Linux affected 2156d9e9f2e483c8c3906c0ea57ea312c1424235 ed71cf465c75f5688b07a35d373cd1d6b589c8ea git Not specified
CNA Linux Linux affected 041e2f945f82fdbd6fff577b79c33469430297aa 33670f780e0120c3dacda188c512bbffe0b6044c git Not specified
CNA Linux Linux affected 864e3396976ef41de6cc7bc366276bf4e084fff2 a98b78116a27e2a57b696b569b2cb431c95cf9b6 git Not specified
CNA Linux Linux affected 864e3396976ef41de6cc7bc366276bf4e084fff2 732fdeb2987c94b439d51f5cb9addddc2fc48c42 git Not specified
CNA Linux Linux affected 864e3396976ef41de6cc7bc366276bf4e084fff2 c4336a07eb6b2526dc2b62928b5104b41a7f81f5 git Not specified
CNA Linux Linux affected 794ddbb7b63b6828c75967b9bcd43b086716e7a1 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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