CVE-2026-43057High· 7.5▾ TwilightIn 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 heade…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Last analysed / modified upstream
0.4% → 0.8%
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.
linux_kernel >= 6.1.149, < 6.1.168linux_kernel >= 6.6.103, < 6.6.134linux_kernel >= 6.12.44, < 6.12.81linux_kernel >= 6.16.4, < 6.17linux_kernel > 6.17.1, < 6.18.22linux_kernel >= 6.19, < 6.19.12linux_kernel = 6.17linux_kernel = 7.0Upgrade past the affected range:
linux_kernel 6.19.12Connected by shared product, vendor, weakness, or advisory.
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