CVE-2025-21629High· 8.2▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets The blamed commit disabled hardware offoad of IPv6 packets with extension headers on devices that advertise…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
0.4% → 0.4%
In the Linux kernel, the following vulnerability has been resolved:
net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets
The blamed commit disabled hardware offoad of IPv6 packets with extension headers on devices that advertise NETIF_F_IPV6_CSUM, based on the definition of that feature in skbuff.h:
- Driver (device) is only able to checksum plain
TCP or UDP packets over IPv6. These are specifically
unencapsulated packets of the form IPv6|TCP or
IPv6|UDP where the Next Header field in the IPv6
header is either TCP or UDP. IPv6 extension headers
are not supported with this feature. This feature
cannot be set in features for a device with
NETIF_F_HW_CSUM also set. This feature is being
DEPRECATED (see below).
The change causes skb_warn_bad_offload to fire for BIG TCP packets.
[ 496.310233] WARNING: CPU: 13 PID: 23472 at net/core/dev.c:3129 skb_warn_bad_offload+0xc4/0xe0
[ 496.310297] ? skb_warn_bad_offload+0xc4/0xe0 [ 496.310300] skb_checksum_help+0x129/0x1f0 [ 496.310303] skb_csum_hwoffload_help+0x150/0x1b0 [ 496.310306] validate_xmit_skb+0x159/0x270 [ 496.310309] validate_xmit_skb_list+0x41/0x70 [ 496.310312] sch_direct_xmit+0x5c/0x250 [ 496.310317] __qdisc_run+0x388/0x620
BIG TCP introduced an IPV6_TLV_JUMBO IPv6 extension header to communicate packet length, as this is an IPv6 jumbogram. But, the feature is only enabled on devices that support BIG TCP TSO. The header is only present for PF_PACKET taps like tcpdump, and not transmitted by physical devices.
For this specific case of extension headers that are not transmitted, return to the situation before the blamed commit and support hardware offload.
ipv6_has_hopopt_jumbo() tests not only whether this header is present, but also that it is the only extension header before a terminal (L4) header.
linux_kernel >= 4.19.323, < 4.20linux_kernel >= 5.4.285, < 5.5linux_kernel >= 5.10.229, < 5.11linux_kernel >= 5.15.171, < 5.16linux_kernel >= 6.1.116, < 6.1.124linux_kernel >= 6.6.60, < 6.6.70linux_kernel >= 6.11.7, < 6.12linux_kernel >= 6.12.1, < 6.12.9linux_kernel = 6.12linux_kernel = 6.13Upgrade past the affected range:
linux_kernel 6.12.9Connected by shared product, vendor, weakness, or advisory.
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