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CVE-2026-23083 In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO
Description
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.19 | earliest → < 6.19 | 6.19 |
| Linux 6.18 | earliest → < 6.18.8 | 6.18.8 |
| Linux 6.12 | earliest → < 6.12.68 | 6.12.68 |
| Linux 6.6 | earliest → < 6.6.122 | 6.6.122 |
| Linux 6.1 | earliest → < 6.1.162 | 6.1.162 |
| Linux 5.15 | earliest → < 5.15.199 | 5.15.199 |
| Linux 5.10 | earliest → < 5.10.249 | 5.10.249 |
| Linux | 3.18 | No fix stated |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
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