9.4
Critical
CVE-2026-31685 In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for…
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets `eui64_mt6()` derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address. The existing guard only rejects an invalid MAC header when `par->fragoff != 0`. For packets with `par->fragoff == 0`, `eui64_mt6()` can still reach `eth_hdr(skb)` even when the MAC header is not valid. Fix this by removing the `par->fragoff != 0` condition so that packets with an invalid MAC header are rejected before accessing `eth_hdr(skb)`.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 7.0 | earliest → < 7.0 | 7.0 |
| Linux 6.19 | earliest → < 6.19.14 | 6.19.14 |
| Linux 6.18 | earliest → < 6.18.24 | 6.18.24 |
| Linux 6.12 | earliest → < 6.12.83 | 6.12.83 |
| Linux 6.6 | earliest → < 6.6.136 | 6.6.136 |
| Linux 6.1 | earliest → < 6.1.175 | 6.1.175 |
| Linux 5.15 | earliest → < 5.15.209 | 5.15.209 |
| Linux 5.10 | earliest → < 5.10.258 | 5.10.258 |
| Linux | 2.6.12 | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | Versions not published |
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