VYPR
← All advisories
High severity7.5NVD Advisory· Published May 1, 2026· Updated May 6, 2026

CVE-2026-43057

CVE-2026-43057

Description

In 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

12
  • Linux/Kernel12 versions
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 11 more
    • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.1.149,<6.1.168
    • cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

6

News mentions

0

No linked articles in our index yet.